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CONTRIBUTORS
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| BART
KOSKO Professor, Electrical Engineering, USC; Author, Heaven in a Chip  Most bell curves have thick tails Any challenge to the normal probability bell curve can have far-reaching consequences because a great deal of modern science and engineering rests on this special bell curve. Most of the standard hypothesis tests in statistics rely on the normal bell curve either directly or indirectly. These tests permeate the social and medical sciences and underlie the poll results in the media. Related tests and assumptions underlie the decision algorithms in radar and cell phones that decide whether the incoming energy blip is a 0 or a 1. Management gurus exhort manufacturers to follow the "six sigma" creed of reducing the variance in products to only two or three defective products per million in accord with "sigmas" or standard deviations from the mean of a normal bell curve. Models for trading stock and bond derivatives assume an underlying normal bell-curve structure. Even quantum and signal-processing uncertainty principles or inequalities involve the normal bell curve as the equality condition for minimum uncertainty. Deviating even slightly from the normal bell curve can sometimes produce qualitatively different results. The proposed dangerous idea stems from two facts about the normal bell curve. First: The normal bell curve is not the only bell curve. There are at least as many different bell curves as there are real numbers. This simple mathematical fact poses at once a grammatical challenge to the title of Charles Murray's IQ book The Bell Curve. Murray should have used the indefinite article "A" instead of the definite article "The." This is but one of many examples that suggest that most scientists simply equate the entire infinite set of probability bell curves with the normal bell curve of textbooks. Nature need not share the same practice. Human and non-human behavior can be far more diverse than the classical normal bell curve allows. Second: The normal bell curve is a skinny bell curve. It puts most of its probability mass in the main lobe or bell while the tails quickly taper off exponentially. So "tail events" appear rare simply as an artifact of this bell curve's mathematical structure. This limitation may be fine for approximate descriptions of "normal" behavior near the center of the distribution. But it largely rules out or marginalizes the wide range of phenomena that take place in the tails. Again most bell curves have thick tails. Rare events are not so rare if the bell curve has thicker tails than the normal bell curve has. Telephone interrupts are more frequent. Lightning flashes are more frequent and more energetic. Stock market fluctuations or crashes are more frequent. How much more frequent they are depends on how thick the tail is — and that is always an empirical question of fact. Neither logic nor assume-the-normal-curve habit can answer the question. Instead scientists need to carry their evidentiary burden a step further and apply one of the many available statistical tests to determine and distinguish the bell-curve thickness. One response to this call for tail-thickness sensitivity is that logic alone can decide the matter because of the so-called central limit theorem of classical probability theory. This important "central" result states that some suitably normalized sums of random terms will converge to a standard normal random variable and thus have a normal bell curve in the limit. So Gauss and a lot of other long-dead mathematicians got it right after all and thus we can continue to assume normal bell curves with impunity. That argument fails in general for two reasons. The first reason it fails is that the classical central limit theorem result rests on a critical assumption that need not hold and that often does not hold in practice. The theorem assumes that the random dispersion about the mean is so comparatively slight that a particular measure of this dispersion — the variance or the standard deviation — is finite or does not blow up to infinity in a mathematical sense. Most bell curves have infinite or undefined variance even though they have a finite dispersion about their center point. The error is not in the bell curves but in the two-hundred-year-old assumption that variance equals dispersion. It does not in general. Variance is a convenient but artificial and non-robust measure of dispersion. It tends to overweight "outliers" in the tail regions because the variance squares the underlying errors between the values and the mean. Such squared errors simplify the math but produce the infinite effects. These effects do not appear in the classical central limit theorem because the theorem assumes them away. The second reason the argument fails is that the central limit theorem itself is just a special case of a more general result called the generalized central limit theorem. The generalized central limit theorem yields convergence to thick-tailed bell curves in the general case. Indeed it yields convergence to the thin-tailed normal bell curve only in the special case of finite variances. These general cases define the infinite set of the so-called stable probability distributions and their symmetric versions are bell curves. There are still other types of thick-tailed bell curves (such as the Laplace bell curves used in image processing and elsewhere) but the stable bell curves are the best known and have several nice mathematical properties. The figure below shows the normal or Gaussian bell curve superimposed over three thicker-tailed stable bell curves. The catch in working with stable bell curves is that their mathematics can be nearly intractable. So far we have closed-form solutions for only two stable bell curves (the normal or Gaussian and the very-thick-tailed Cauchy curve) and so we have to use transform and computer techniques to generate the rest. Still the exponential growth in computing power has long since made stable or thick-tailed analysis practical for many problems of science and engineering. This last point shows how competing bell curves offer a new context for judging whether a given set of data reasonably obey a normal bell curve. One of the most popular eye-ball tests for normality is the PP or probability plot of the data. The data should almost perfectly fit a straight line if the data come from a normal probability distribution. But this seldom happens in practice. Instead real data snake all around the ideal straight line in a PP diagram. So it is easy for the user to shrug and a call any data deviation from the ideal line good enough in the absence of a direct bell-curve competitor. A fairer test is to compare the normal PP plot with the best-fitting thick-tailed or stable PP plot. The data may well line up better in a thick-tailed PP diagram than it does in the usual normal PP diagram. This test evidence would reject the normal bell-curve hypothesis in favor of the thicker-tailed alternative. Ignoring these thick-tailed alternatives favors accepting the less-accurate normal bell curve and thus leads to underestimating the occurrence of tail events. Stable or thick-tailed probability curves continue to turn up as more scientists and engineers search for them. They tend to accurately model impulsive phenomena such as noise in telephone lines or in the atmosphere or in fluctuating economic assets. Skewed versions appear to best fit the data for the Ethernet traffic in bit packets. Here again the search is ultimately an empirical one for the best-fitting tail thickness. Similar searches will only increase as the math and software of thick-tailed bell curves work their way into textbooks on elementary probability and statistics. Much of it is already freely available on the Internet. Thicker-tail bell curves also imply that there is not just a single form of pure white noise. Here too there are at least as many forms of white noise (or any colored noise) as there are real numbers. Whiteness just means that the noise spikes or hisses and pops are independent in time or that they do not correlate with one another. The noise spikes themselves can come from any probability distribution and in particular they can come from any stable or thick-tailed bell curve. The figure below shows the normal or Gaussian bell curve and three kindred thicker-tailed bell curves and samples of their corresponding white noise. The normal curve has the upper-bound alpha parameter of 2 while the thicker-tailed curves have lower values — tail thickness increases as the alpha parameter falls. The white noise from the thicker-tailed bell curves becomes much more impulsive as their bell narrows and their tails thicken because then more extreme events or noise spikes occur with greater frequency.
Competing bell curves:
The figure on the left shows four superimposed
symmetric alpha-stable bell curves with different
tail thicknesses while the plots on the right
show samples of their corresponding forms
of white noise. The parameter My colleagues and I have recently shown that most mathematical models of spiking neurons in the retina can not only benefit from small amounts of added noise by increasing their Shannon bit count but they still continue to benefit from added thick-tailed or "infinite-variance" noise. The same result holds experimentally for a carbon nanotube transistor that detects signals in the presence of added electrical noise. Thick-tailed bell curves further call into question what counts as a statistical "outlier" or bad data: Is a tail datum error or pattern? The line between extreme and non-extreme data is not just fuzzy but depends crucially on the underlying tail thickness. The usual rule of thumb is that the data is suspect if it lies outside three or even two standard deviations from the mean. Such rules of thumb reflect both the tacit assumption that dispersion equals variance and the classical central-limit effect that large data sets are not just approximately bell curves but approximately thin-tailed normal bell curves. An empirical test of the tails may well justify the latter thin-tailed assumption in many cases. But the mere assertion of the normal bell curve does not. So "rare" events may not be so rare after all. |
DAVID
PIZARRO Hodgepodge Morality What some individuals consider a sacrosanct ability to perceive moral truths may instead be a hodgepodge of simpler psychological mechanisms, some of which have evolved for other purposes. It is increasingly apparent that our moral sense comprises a fairly loose collection of intuitions, rules of thumb, and emotional responses that may have emerged to serve a variety of functions, some of which originally had nothing at all to do with ethics. These mechanisms, when tossed in with our general ability to reason, seem to be how humans come to answer the question of good and evil, right and wrong. Intuitions about action, intentionality, and control, for instance, figure heavily into our perception of what constitutes an immoral act. The emotional reactions of empathy and disgust likewise figure into our judgments of who deserves moral protection and who doesn't. But the ability to perceive intentions probably didn't evolve as a way to determine who deserves moral blame. And the emotion of disgust most likely evolved to keep us safe from rotten meat and feces, not to provide information about who deserves moral protection. Discarding the belief that our moral sense provides a royal road to moral truth is an uncomfortable notion. Most people, after all, are moral realists. They believe acts are objectively right or wrong, like math problems. The dangerous idea is that our intuitions may be poor guides to moral truth, and can easily lead us astray in our everyday moral decisions. |
| RANDOPLH
M. NESSE Psychiatrist, University of Michigan; Coauthor (with George Williams), Why We Get Sick: The New Science of Darwinian Medicine 
Unspeakable Ideas The idea of promoting dangerous ideas seems dangerous to me. I spend considerable effort to prevent my ideas from becoming dangerous, except, that is, to entrenched false beliefs and to myself. For instance, my idea that bad feelings are useful for our genes upends much conventional wisdom about depression and anxiety. I find, however, that I must firmly restrain journalists who are eager to share the sensational but incorrect conclusion that depression should not be treated. Similarly, many people draw dangerous inferences from my work on Darwinian medicine. For example, just because fever is useful does not mean that it should not be treated. I now emphasize that evolutionary theory does not tell you what to do in the clinic, it just tells you what studies need to be done. I also feel obligated to prevent my ideas from becoming dangerous on a larger scale. For instance, many people who hear about Darwinian medicine assume incorrectly that it implies support for eugenics. I encourage them to read history as well as my writings. The record shows how quickly natural selection was perverted into Social Darwinism, an ideology that seemed to justify letting poor people starve. Related ideas keep emerging. We scientists have a responsibility to challenge dangerous social policies incorrectly derived from evolutionary theory. Racial superiority is yet another dangerous idea that hurts real people. More examples come to mind all too easily and some quickly get complicated. For instance, the idea that men are inherently different from women has been used to justify discrimination, but the idea that men and women have identical abilities and preferences may also cause great harm. While I don't want to promote ideas dangerous to others, I am fascinated by ideas that are dangerous to anyone who expresses them. These are "unspeakable ideas." By unspeakable ideas I don't mean those whose expression is forbidden in a certain group. Instead, I propose that there is class of ideas whose expression is inherently dangerous everywhere and always because of the nature of human social groups. Such unspeakable ideas are anti-memes. Memes, both true and false, spread fast because they are interesting and give social credit to those who spread them. Unspeakable ideas, even true important ones, don't spread at all, because expressing them is dangerous to those who speak them. So why, you may ask, is a sensible scientist even bringing the idea up? Isn't the idea of unspeakable ideas a dangerous idea? I expect I will find out. My hope is that a thoughtful exploration of unspeakable ideas should not hurt people in general, perhaps won't hurt me much, and might unearth some long-neglected truths. Generalizations cannot substitute for examples, even if providing examples is risky. So, please gather your own data. Here is an experiment. The next time you are having a drink with an enthusiastic fan for your hometown team, say "Well, I think our team just isn't very good and didn't deserve to win." Or, moving to more risky territory, when your business group is trying to deal with a savvy competitor, say, "It seems to me that their product is superior because they are smarter than we are." Finally, and I cannot recommend this but it offers dramatic data, you could respond to your spouse's difficulties at work by saying, "If they are complaining about you not doing enough, it is probably because you just aren't doing your fair share." Most people do not need to conduct such social experiments to know what happens when such unspeakable ideas are spoken. Many broader truths are equally unspeakable. Consider, for instance, all the articles written about leadership. Most are infused with admiration and respect for a leader's greatness. Much rarer are articles about the tendency for leadership positions to be attained by power-hungry men who use their influence to further advance their self-interest. Then there are all the writings about sex and marriage. Most of them suggest that there is some solution that allows full satisfaction for both partners while maintaining secure relationships. Questioning such notions is dangerous, unless you are a comic, in which case skepticism can be very, very funny. As a final example, consider the unspeakable idea of unbridled self-interest. Someone who says, "I will only do what benefits me," has committed social suicide. Tendencies to say such things have been selected against, while those who advocate goodness, honesty and service to others get wide recognition. This creates an illusion of a moral society that then, thanks to the combined forces of natural and social selection, becomes a reality that makes social life vastly more agreeable. There are many more examples, but I must stop here. To say more would either get me in trouble or falsify my argument. Will I ever publish my "Unspeakable Essays?" It would be risky, wouldn't it? |
GREGORY
BENFORD Think outside the Kyoto box Few economists
expect the Kyoto Accords to attain their goals. With compliance coming
only slowly and with three big holdouts — the US, China and
India — it seems unlikely to make much difference in overall
carbon dioxide increases. Yet all the political pressure is on lessening
our fossil fuel burning, in the face of fast-rising demand. Take advantage
of that. The leftover corn cobs and stalks from our fields can be
gathered up, floated down the Mississippi, and dropped into the ocean,
sequestering it. Below about a kilometer depth, beneath a layer called
the thermocline, nothing gets mixed back into the air for a thousand
years or more. It's not a forever solution, but it would buy us and
our descendents time to find such answers. And it is inexpensive;
cost matters. Reflect
Away Sunlight |
MARCO
IACOBONI Media Violence Induces Imitative Violence: The Problem With Super Mirrors Media violence induces imitative violence. If true, this idea is dangerous for at least two main reasons. First, because its implications are highly relevant to the issue of freedom of speech. Second, because it suggests that our rational autonomy is much more limited than we like to think. This idea is especially dangerous now, because we have discovered a plausible neural mechanism that can explain why observing violence induces imitative violence. Moreover, the properties of this neural mechanism — the human mirror neuron system — suggest that imitative violence may not always be a consciously mediated process. The argument for protecting even harmful speech (intended in a broad sense, including movies and videogames) has typically been that the effects of speech are always under the mental intermediation of the listener/viewer. If there is a plausible neurobiological mechanism that suggests that such intermediate step can be by-passed, this argument is no longer valid. For more than 50 years behavioral data have suggested that media violence induces violent behavior in the observers. Meta-data show that the effect size of media violence is much larger than the effect size of calcium intake on bone mass, or of asbestos exposure to cancer. Still, the behavioral data have been criticized. How is that possible? Two main types of data have been invoked. Controlled laboratory experiments and correlational studies assessing types of media consumed and violent behavior. The lab data have been criticized on the account of not having enough ecological validity, whereas the correlational data have been criticized on the account that they have no explanatory power. Here, as a neuroscientist who is studying the human mirror neuron system and its relations to imitation, I want to focus on a recent neuroscience discovery that may explain why the strong imitative tendencies that humans have may lead them to imitative violence when exposed to media violence. Mirror neurons are cells located in the premotor cortex, the part of the brain relevant to the planning, selection and execution of actions. In the ventral sector of the premotor cortex there are cells that fire in relation to specific goal-related motor acts, such as grasping, holding, tearing, and bringing to the mouth. Surprisingly, a subset of these cells — what we call mirror neurons — also fire when we observe somebody else performing the same action. The behavior of these cells seems to suggest that the observer is looking at her/his own actions reflected by a mirror, while watching somebody else's actions. My group has also shown in several studies that human mirror neuron areas are critical to imitation. There is also evidence that the activation of this neural system is fairly automatic, thus suggesting that it may by-pass conscious mediation. Moreover, mirror neurons also code the intention associated with observed actions, even though there is not a one-to-one mapping between actions and intentions (I can grasp a cup because I want to drink or because I want to put it in the dishwasher). This suggests that this system can indeed code sequences of action (i.e., what happens after I grasp the cup), even though only one action in the sequence has been observed. Some years ago, when we still were a very small group of neuroscientists studying mirror neurons and we were just starting investigating the role of mirror neurons in intention understanding, we discussed the possibility of super mirror neurons. After all, if you have such a powerful neural system in your brain, you also want to have some control or modulatory neural mechanisms. We have now preliminary evidence suggesting that some prefrontal areas have super mirrors. I think super mirrors come in at least two flavors. One is inhibition of overt mirroring, and the other one — the one that might explain why we imitate violent behavior, which require a fairly complex sequence of motor acts — is mirroring of sequences of motor actions. Super mirror mechanisms may provide a fairly detailed explanation of imitative violence after being exposed to media violence. |
BARRY
C. SMITH What We Know May Not Change Us Human beings, like everything else, are part of the natural world. The natural world is all there is. But to say that everything that exists is just part of the one world of nature is not the same as saying that there is just one theory of nature that will describes and explain everything that there is. Reality may be composed of just one kind of stuff and properties of that stuff but we need many different kinds of theories at different levels of description to account for everything there is. Theories at these different levels may not be reduced one to another. What matters is that they be compatible with one another. The astronomy Newton gave us was a triumph over supernaturalism because it united the mechanics of the sub-lunary world with an account of the heavenly bodies. In a similar way, biology allowed us to advance from a time when we saw life in terms of an elan vital. Today, the biggest challenge is to explain our powers of thinking and imagination, our abilities to represent and report our thoughts: the very means by which we engage in scientific theorising. The final triumph of the natural sciences over supernaturalism will be an account of nature of conscious experience. The cognitive and brain sciences have done much to make that project clearer but we are still a long way from a fully satisfying theory. But even if we succeed in producing a theory of human thought and reason, of perception, of conscious mental life, compatible with other theories of the natural and biological world, will we relinquish our cherished commonsense conceptions of ourselves as human beings, as selves who know ourselves best, who deliberate and decide freely on what to do and how to live? There is much evidence that we won't. As humans we conceive ourselves as centres of experience, self-knowing and free willing agents. We see ourselves and others as acting on our beliefs, desires, hopes and fears, and has having responsibility for much that we do and all that we say. And even as results in neuroscience begin to show how much more automated, routinised and pre-conscious much of our behaviour is, we are remain unable to let go of the self-beliefs that govern our day to day rationalisings and dealings with others. We are perhaps incapable of treating others as mere machines, even if that turns out to be what we are. The self-conceptions we have are firmly in place and sustained in spite of our best findings, and it may be a fact about human beings that it will always be so. We are curious and interested in neuroscientists findings and we wonder at them and about their applications to ourselves, but as the great naturalistic philosopher David Hume knew, nature is too strong in us, and it will not let us give up our cherished and familiar ways of thinking for long. Hume knew that however curious an idea and vision of ourselves we entertained in our study, or in the lab, when we returned to the world to dine, make merry with our friends our most natural beliefs and habits returned and banished our stranger thoughts and doubts. It is likely, as this end of the year, that whatever we have learned and whatever we know about the error of our thinkings and about the fictions we maintain, they will still remain the most dominant guiding force in our everyday lives. We may not be comforted by this, but as creatures with minds who know they have minds — perhaps the only minded creatures in nature in this position — we are at least able to understand our own predicament. |
| PHILIP
W. ANDERSON Physicist, Princeton University; Nobel Laureate in Physics 1977; Author, Economy as a Complex Evolving System  Dark Energy might not exist Let's
try one in cosmology.
The universe contains
at least 3 and
perhaps 4 very
different kinds
of matter, whose
origins probably
are physically
completely different.
There is the Cosmic
Background Radiation
(CBR) which is
photons from the
later parts of
the Big Bang but
is actually the
residue of all
the kinds of radiation
that were in the
Bang, like flavored
hadrons and mesons
which have annihilated
and become photons.
You can count them
and they tell you
pretty well how
many quanta of
radiation there
were in the beginning;
and observation
tells us that they
were pretty uniformly distributed,
in fact very, and
still are. In
fact out to a tenth of the Hubble radius, which is as far
as we can see, the protons are very non-uniformly
distributed, in a fractal hierarchical clustering with
things called "Great Walls" and giant near-voids.
The conventional idea is that this is all caused by gravitational
instability acting on tiny primeval fluctuations, and it
barely could be, but in order to justify that you have
to have another kind of matter. Finally, of course there is Dark Energy, that is if there is. On that we can't even guess if it is quanta at all, but again we note that if it is it probably doesn't add up in numbers to the CBR. The very strange coincidence is that when we add this in there isn't any total gravitation at all, and the universe as a whole is flat, as it would be, incidentally, if all of the heavy parts were distributed everywhere according to some random, fractal distribution like that of the matter we can see — because on the largest scale, a fractal's density extrapolates to zero. That suggestion, implying that Dark Energy might not exist, is considered very dangerously radical. The posterior probability of any particular God is pretty small Here's another, which compared to many other peoples' propositions isn't so radical. Isn't God very improbable? You can't in any logical system I can understand disprove the existence of God, or prove it for that matter. But I think that in the probability calculus I use He is very improbable. There are a number of ways of making a formal probability theory which incorporate Ockham's razor, the principle that one must not multiply hypotheses unnecessarily. Two are called Bayesian probability theory, and Minimum Entropy. If you have been taking data on something, and the data are reasonably close to a straight line, these methods give us a definable procedure by which you can estimate the probability that the straight line is correct, not the polynomial which has as many parameters as there are points, or some intermediate complex curve. Ockham's razor is expressed mathematically as the fact that there is a factor in the probability derived for a given hypothesis that decreases exponentially in the number N of parameters that describe your hypothesis — it is the inverse of the volume of parameter space. People who are trying to prove the existence of ESP abominate Bayesianism and this factor because it strongly favors the "Null hypothesis" and beats them every time. Well, now, imagine how big the parameter space is for God. He could have a long gray beard or not, be benevolent or malicious in a lot of different ways and over a wide range of values, he can have a variety of views on abortion, contraception, like or abominate human images, like or abominate music, and the range of dietary prejudices He has been credited with is as long as your arm. There is the heaven-hell dimension, the one vs three question, and I haven't even mentioned polytheism. I think there are certainly as many parameters as sects, or more. If there is even a sliver of prior probability for the null hypothesis, the posterior probability of any particular God is pretty small. |
| TIMOTHY
TAYLOR Archaeologist, University of Bradford; Author, The Buried Soul l  The human brain is a cultural artefact. Phylogenetically, humans represent an evolutionary puzzle. Walking on two legs free the hands to do new things, like chip stones to make modified tools — the first artefacts, dating to 2.7 million years ago — but it also narrows the pelvis and dramatically limits the size of possible fetal cranium. Thus the brain expansion that began after 2 million years ago should not have happened. But imagine that, alongside chipped stone tools, one genus of hominin appropriates the looped entrails of a dead animal, or learns to tie a simple knot, and invents a sling (chimpanzees are known to carry water in leaves and gorillas to measure water depth with sticks, so the practical and abstract thinking required here can be safely assumed for our human ancestors by this point). In its sling, the hominin child can now hip ride with little impairment to its parent's hands-free movement. This has the unexpected and certainly unplanned consequence that it is no longer important for it to be able to hang on as chimps do. Although, due to the bio-mechanical constraints of a bipedal pelvis, the hominin child cannot be born with a big head (thus large initial brain capacity) it can now be born underdeveloped. That is to say, the sling frees fetuses to be born in an ever more ontogenically retarded state. This trend, which humans do indeed display, is called neoteny. The retention of earlier features for longer means that the total developmental sequence is extended in time far beyond the nine months of natural gestation. Hominin children, born underdeveloped, could grow their crania outside the womb in the pseudo-marsupial pouch of an infant-carrying sling. From this point onwards it is not hard to see how a distinctively human culture emerges through the extra-uterine formation of higher cognitive capacities — the phylogenetic and ontogenic icing on the cake of primate brain function. The child, carried by the parent into social situations, watches vocalization. Parental selection for smart features such as an ability to babble early may well, as others have suggested, have driven the brain size increases until 250,000 years ago — a point when the final bio-mechanical limits of big-headed mammals with narrow pelvises were reached by two species: Neanderthals and us. This is the phylogeny side of the case. In terms of ontogeny the obvious applies — it recapitulates phylogeny. The underdeveloped brains of hominin infants were culture-prone, and in this sense, I do not dissent from Dan Sperber's dangerous idea that ‘culture is natural'. But human culture, unlike the basic culture of learned routines and tool-using observed in various mammals, is a system of signs — essentially the association of words with things and the ascription and recognition of value in relation to this. As Ernest Gellner once pointed out, taken cross-culturally, as a species, humans exhibit by far the greatest range of behavioural variation of any animal. However, within any on-going community of people, with language, ideology and a culturally-inherited and developed technology, conformity has usually been a paramount value, with death often the price for dissent. My belief is that, due to the malleability of the neotenic brain, cultural systems are physically built into the developing tissue of the mind. Instead of seeing the brain as the genetic hardware into which the cultural software is loaded, and then arguing about the relative determining influences of each in areas such as, say, sexual orientation or mathematical ability (the old nature-nurture debate), we can conclude that culture (as Richard Dawkins long ago noted in respect of contraception) acts to subvert genes, but is also enabled by them. Ontogenic retardation allowed both environment and the developing milieu of cultural routines to act on brain hardware construction alongside the working through of the genetic blueprint. Just because the modern human brain is coded for by genes does not mean that the critical self-consciousness for which it (within its own community of brains) is famous is non-cultural any more than a barbed-and-tanged arrowhead is non-cultural just because it is made of flint. The human brain has a capacity to go not just beyond nature, but beyond culture too, by dissenting from old norms and establishing others. The emergence of the high arts and science is part of this process of the human brain, with its instrumental extra-somatic adaptations and memory stores (books, laboratories, computers), and is underpinned by the most critical thing that has been brought into being in the encultured human brain: free will. However, not all humans, or all human communities, seem capable of equal levels of free-will. In extreme cases they appear to display none at all. Reasons include genetic incapacity, but it is also possible for a lack of mental freedom to be culturally engendered, and sometimes even encouraged. Archaeologically, the evidence is there from the first farming societies in Europe: the Neolithic massacre at Talheim, where an entire community was genocidally wiped out except for the youngest children, has been taken as evidence (supported by anthropological analogies) of the re-enculturation of still flexible minds within the community of the victors, to serve and live out their orphaned lives as slaves. In the future, one might surmise that the dark side of the development of virtual reality machines (described by Clifford Pickover) will be the infinitely more subtle cultural programming of impressionable individuals as sophisticated conformists. The interplay of genes and culture has produced in us potential for a formidable range of abilities and intelligences. It is critical that in the future we both fulfil and extend this potential in the realm of judgment, choice and understanding in both sciences and arts. But the idea of the brain as a cultural artefact is dangerous. Those with an interest in social engineering — tyrants and authoritarian regimes — will almost certainly attempt to develop it to their advantage. Free-will is threatening to the powerful who, by understanding its formation, will act to undermine it in sophisticated ways. The usefulness of cultural artefacts that have the degree of complexity of human brains makes our own species the most obvious candidate for the enhanced super-robot of the future, not just smart factory operatives and docile consumers, but cunning weapons-delivery systems (suicide bombers) and conformity-enforcers. At worst, the very special qualities of human life that have been enabled by our remarkable natural history, the confluence of genes and culture, could end up as a realm of freedom for an elite few. |
OLIVER
MORTON Our planet is not in peril The truth of this idea is pretty obvious. Environmental crises are a fundamental part of the history of the earth: there have been sudden and dramatic temperature excursions, severe glaciations, vast asteroid and comet impacts. Yet the earth is still here, unscathed. There have been mass extinctions associated with some of these events, while other mass extinctions may well have been triggered by subtler internal changes to the biosphere. But none of them seem to have done long-term harm. The first ten million years of the Triassic may have been a little dull by comparison to the late Palaeozoic, what with a large number of the more interesting species being killed in the great mass extinction at the end of the Permian, but there is no evidence that any fundamentally important earth processes did not eventually recover. I strongly suspect that not a single basic biogeochemical innovation — the sorts of thing that underlie photosynthesis and the carbon cycle, the nitrogen cycle, the sulphur cycle and so on — has been lost in the past 4 billion years. Indeed, there is an argument to be made that mass extinctions are in fact a good thing, in that they wipe the slate clean a bit and thus allow exciting evolutionary innovations. This may be going a bit far. While the Schumpeter-for-the-earth-system position seems plausible, it also seems a little crudely progressivist. While to a mammal the Tertiary seems fairly obviously superior to the Cretaceous, it's not completely clear to me that there's an objective basis for that belief. In terms of primary productivity, for example, the Cretaceous may well have had an edge. But despite all this, it's hard to imagine that the world would be a substantially better place if it had not undergone the mass extinctions of the Phanerozoic. Against this background, the current carbon/climate crisis seems pretty small beer. The change in mean global temperatures seems quite unlikely to be much greater than the regular cyclical change between glacial and interglacial climates. Land use change is immense, but it's not clear how long it will last, and there are rich seedbanks in the soil that will allow restoration. If fossil fuel use goes unchecked, carbon dioxide levels may rise as high as they were in the Eocene, and do so at such a rate that they cause a transient spike in ocean acidity. But they will not stay at those high levels, and the Eocene was not such a terrible place. The earth doesn't need ice caps, or permafrost, or any particular sea level. Such things come and go and rise and fall as a matter of course. The planet's living systems adapt and flourish, sometimes in a way that provides negative feedback, occasionally with a positive feedback that amplifies the change. A planet that made it through the massive biogeochemical unpleasantness of the late Permian is in little danger from a doubling, or even a quintupling, of the very low carbon dioxide level that preceded the industrial revolution, or from the loss of a lot of forests and reefs, or from the demise of half its species, or from the thinning of its ozone layer at high latitudes. But none of this is to say that we as people should not worry about global change; we should worry a lot. This is because climate change may not hurt the planet, but it hurts people. In particular, it will hurt people who are too poor to adapt. Significant climate change will change rainfall patterns, and probably patterns of extreme events as well, in ways that could easily threaten the food security of hundreds of millions of people supporting themselves through subsistence agriculture or pastoralism. It will have a massive effect on the lives of the relatively small number of people in places where sea ice is an important part of the environment (and it seems unlikely that anything we do now can change that). In other, more densely populated places local environmental and biotic change may have similarly sweeping effects. Secondary to this, the loss of species, both known and unknown, will be experienced by some as a form of damage that goes beyond any deterioration in ecosystem services. Many people will feel themselves and their world diminished by such extinctions even when they have no practical consequences, despite the fact that they cannot ascribe an objective value to their loss. One does not have to share the values of these people to recognise their sincerity. All of these effects provide excellent reasons to act. And yet many people in the various green movements feel compelled to add on the notion that the planet itself is in crisis, or doomed; that all life on earth is threatened. And in a world where that rhetoric is common, the idea that this eschatological approach to the environment is baseless is a dangerous one. Since the 1970s the environmental movement has based much of its appeal on personifying the planet and making it seem like a single entity, then seeking to place it in some ways "in our care". It is a very powerful notion, and one which benefits from the hugely influential iconographic backing of the first pictures of the earth from space; it has inspired much of the good that the environmental movement has done. The idea that the planet is not in peril could thus come to undermine the movement's power. This is one of the reasons people react against the idea so strongly. One respected and respectable climate scientist reacted to Andy Revkin's recent use of the phrase "In fact, the planet has nothing to worry about from global warming" in the New York Times with near apoplectic fury. If the belief that the planet is in peril were merely wrong, there might be an excuse for ignoring it, though basing one's actions on lies is an unattractive proposition. But the planet-in-peril idea is an easy target for those who, for various reasons, argue against any action on the carbon/climate crisis at all. In this, bad science is a hostage to fortune. What's worse, the idea distorts environmental reasoning, too. For example, laying stress on the non-issue of the health of the planet, rather than the real issues of effects that harm people, leads to a general preference for averting change rather than adapting to it, even though providing the wherewithal for adaptation will often be the most rational response. The planet-in-peril idea persists in part simply through widespread ignorance of earth history. But some environmentalists, and perhaps some environmental reporters, will argue that the inflated rhetoric that trades on this error is necessary in order to keep the show on the road. The idea that people can be more easily persuaded to save the planet, which is not in danger, than their fellow human beings, who are, is an unpleasant and cynical one; another dangerous idea, not least because it may indeed hold some truth. But if putting the planet at the centre of the debate is a way of involving everyone, of making us feel that we're all in this together, then one can't help noticing that the ploy isn't working out all that well. In the rich nations, many people may indeed believe that the planet is in danger — but they don't believe that they are in danger, and perhaps as a result they're not clamouring for change loud enough, or in the right way, to bring it about. There is also a problem of learned helplessness. I suspect people are flattered, in a rather perverse way, by the idea that their lifestyle threatens the whole planet, rather than just the livelihoods of millions of people they have never met. But the same sense of scale that flatters may also enfeeble. They may come to think that the problems are too great for them to do anything about. Rolling carbon/climate issues into the great moral imperative of improving the lives of the poor, rather than relegating them to the dodgy rhetorical level of a threat to the planet as a whole, seems more likely to be a sustainable long-term strategy. The most important thing about environmental change is that it hurts people; the basis of our response should be human solidarity. The planet will take care of itself. |
SAMUEL
BARONDES Using Medications To Change Personality Personality — the pattern of thoughts, feelings, and actions that is typical of each of us — is generally formed by early adulthood. But many people still want to change. Some, for example, consider themselves too gloomy and uptight and want to become more cheerful and flexible. Whatever their aims they often turn to therapists, self-help books, and religious practices. In the past few decades certain psychiatric medications have become an additional tool for those seeking control of their lives. Initially designed to be used for a few months to treat episodic psychological disturbances such as severe depression, they are now being widely prescribed for indefinite use to produce sustained shifts in certain personality traits. Prozac is the best known of them, but many others are on the market or in development. By directly affecting brain circuits that control emotions, these medications can produce desirable effects that may be hard to replicate by sheer force of will or by behavioral exercises. Millions keep taking them continuously, year after year, to modulate personality. Nevertheless, despite the testimonials and apparent successes, the sustained use of such drugs to change personality should still be considered dangerous. Not because manipulation of brain chemicals is intrinsically cowardly, immoral, or a threat to the social order. In the opinion of experienced clinicians medications such as Prozac may actually have the opposite effect, helping to build character and to increase personal responsibility. The real danger is that there are no controlled studies of the effects of these drugs on personality over the many years or even decades in which some people are taking them. So we are left with a reliance on opinion and belief. And this, as in all fields, we know to be dangerous. |
DAVID
BODANIS I wonder sometimes if the hyper-Islamicist critique of the West as a decadent force that is already on a downhill course might be true. At first it seems impossible: no one's richer than the US, and no one has as powerful an Army; western Europe has vast wealth and university skills as well. But what got me reflecting was the fact that in just four years after Pearl Harbor, the US had defeated two of the greatest military forces the world had ever seen. Everyone naturally accepted there had to be restrictions on gasoline sales, to preserve limited source of gasoline and rubber; profiteers were hated. But the first four years after 9/11? Detroit automakers find it easy to continue paying off congressmen to ensure that gasoline-wasting SUV's aren't restricted in any way. There are deep trends behind this. Technology is supposed to be speeding up, but if you think about it, airplanes have a similar feel and speed to ones of 30 years ago; cars and oil rigs and credit cards and the operations of the NYSE might be a bit more efficient than a few decades ago, but also don't feel fundamentally different. Aside from the telephones, almost all the objects and and daily habits in Spielberg's 20 year old film E.T. are about the same as today. What has transformed is the possibility of quick change. It's a lot, lot harder than it was before. Patents for vague, general ideas are much easier to get than they were before, which slows down the introduction of new technology; academics in biotech and other fields are wary about sharing their latest research with potentially competing colleagues (which slows down the creation of new technology as well). Even more, there's a tension, a fear of falling from the increasingly fragile higher tiers of society, which means that social barriers are higher as well. I went to adequate but not extraordinary public (state) schools in Chicago, but my children go to private schools. I suspect that many contributors to this site, unless they live in academic towns where state schools are especially strong, are in a similar position. This is fine for our children, but not for those of the same theoretical potential, yet who lack parents who can afford it. Sheer inertia can mask such flaws for quite a while. The National Academy of Sciences has shown that, once again, the percentage of American-born university students studying the hard physical sciences has gone down. At one time that didn't matter, for life in America — and at the top American universities — was an overwhelming lure for ambitious youngsters from Seoul and Bangalore. But already there are signs of that slipping, and who knows what it'll be like in another decade or two. There's another sort of inertia that's coming to an end as well. The first generation of immigrants from farm to city bring with them the attitudes of their farm world; the first generation of 'migrants' from blue collar city neighborhoods to upper middle class professional life bring similar attitudes of responsibility as well. We ignore what the media pours out about how we're supposed to live. We're responsible for parents, even when it's not to our economic advantage; we vote against our short-term economic interests, because it's the 'right' thing to do; we engage in philanthropy towards individuals of very different backgrounds from ourselves. But why? In many parts of America or Europe, the rules and habits creating those attitudes no longer exist at all. When that finally gets cut away, will what replaces it be strong enough for us to survive? |
NICHOLAS
HUMPHREY Bertrand Russell's idea, put forward 80 years ago, is about as dangerous as they come. I don't think I can better it: "I wish to propose for the reader's favourable consideration a doctrine which may, I fear, appear wildly paradoxical and subversive. The doctrine in question is this: that it is undesirable to believe in a proposition when there is no ground whatever for supposing it true." (The opening lines of his Sceptical essays). |
ERIC
FISCHL Several years ago I stood in front of a painting by Vermeer. It was a painting of a woman reading a letter. She stood near the window for better lighting and behind her hung a map of the known world. I was stunned by the revelation of this work. Vermeer understood something so basic to human need it had gone virtually unnoticed: communication from afar. Everything we have done to make us more capable, more powerful, better protected, more intelligent, has been by enhancing our physical limitations, our perceptual abilities, our adaptability. When I think of Vermeer's woman reading the letter I wonder how long did it take to get to her? Then I think, my god, at some time we developed a system in which one could leave home and send word back! We figured out a way that we could be heard from far away and then another system so that we can be seen from far away. Then I start to marvel at the alchemy of painting and how we have been able to invest materials with consciousness so that Vermeer can talk to me across time! I see too he has put me in the position of not knowing as I am kept from reading the content of the letter. In this way he has placed me at the edge, the frontier of wanting to know what I cannot know. I want to know how long has this letter sender been away and what was he doing all this time. Is he safe? Does he still love her? Is he on his way home? Vermeer puts me into what had been her condition of uncertainty. All I can do is wonder and wait. This makes me think about how not knowing is so important. Not knowing makes the world large and uncertain and our survival tenuous. It is a mystery why humans roam and still more a mystery why we still need to feel so connected to the place we have left. The not knowing causes such profound anxiety it, in turn, spawns creativity. The impetus for this creativity is empowerment. Our gadgets, gizmoes, networks of transportation and communication, have all been developed either to explore, utilize or master the unknown territory. If the unknown becomes known, and is not replaced with a new unknown, if the farther we reach outward is connected only to how fast we can bring it home, if the time between not knowing and knowing becomes too small, creativity will be daunted. And so I worry, if we bring the universe more completely, more effortlessly, into our homes will there be less reason to leave them? |
STANISLAS
DEHEANE Touching and pushing the limits of the human brain From Copernicus to Darwin to Freud, science has a special way of deflating human hubris by proposing what is frequently perceived, at the time, as dangerous or pernicious ideas. Today, cognitive neuroscience presents us with a new challenging idea, whose accommodation will require substantial personal and societal effort — the discovery of the intrinsic limits of the human brain. Calculation
was one of the first domains where we lost our special status — right
from their inception, computers were faster than the human brain,
and they are now billions of times ahead of us in their speed and
breadth of number crunching. Psychological research shows that our
mental "central executive" is amazingly limited — we
can process only one thought at a time, at a meager rate of five
or ten per second at most. This is rather surprising. Isn't the human
brain supposed to be the most massively parallel machine on earth?
Yes, but its architecture is such that the collective outcome of
this parallel organization, our mind, is a very slow serial processor.
What we can become aware of is intrinsically limited. Whenever we
delve deeply into the processing of one object, we become literally
blind to other items that would require our attention (the "attentional
blink" paradigm). We also suffer from an "illusion of seeing":
we think that we take in a whole visual scene and see it all at once,
but research shows that major chunks of the image can be changed
surreptitiously without our noticing. |
JOEL
GARREAU Suppose
Faulkner was right?
It's
easy to dismiss such optimism. The reason I hope Faulkner was right,
however, is that we are at a turning point in history. For the first
time, our technologies are not so much aimed outward at modifying
our environment in the fashion of fire, clothes, agriculture, cities
and space travel. Instead, they are increasingly aimed inward at
modifying our minds, memories, metabolisms, personalities and progeny.
If we can do all that, then we are entering an era of engineered
evolution — radical evolution, if you will — in which
we take control of what it will mean to be human. You can get different versions of what that might mean. Some
would have you believe that a future in which our creations eliminate
the ills that have plagued mankind for millennia — conquering
pain, suffering, stupidity, ignorance and even death — is a
vision of heaven. Some even welcome the idea that someday soon, our
creations will surpass the pitiful limitations of Version 1.0 humans,
themselves becoming a successor race that will conquer the universe,
and care for us benevolently. |
HELEN
FISHER If patterns of human love subtlely change, all sorts of social and political atrocities can escalate Serotonin-enhancing antidepressants (such as Prozac and many others) can jeopardize feelings of romantic love, feelings of attachment to a spouse or partner, one's fertility and one's genetic future. I
am working with psychiatrist Andy Thomson on this topic. We base
our hypothesis on patient reports, fMRI studies, and other data on
the brain. SSRIs also suppress sexual desire, sexual arousal and orgasm in as many as 73% of users. These sexual responses evolved to enhance courtship, mating and parenting. Orgasm produces a flood of oxytocin and vasopressin, chemicals associated with feelings of attachment and pairbonding behaviors. Orgasm is also a device by which women assess potential mates. Women do not reach orgasm with every coupling and the "fickle" female orgasm is now regarded as an adaptive mechanism by which women distinguish males who are willing to expend time and energy to satisfy them. The onset of female anorgasmia may jeopardize the stability of a long-term mateship as well. Men who take serotonin-enhancing antidepressants also inhibit evolved mechanisms for mate selection, partnership formation and marital stability. The penis stimulates to give pleasure and advertise the male's psychological and physical fitness; it also deposits seminal fluid in the vaginal canal, fluid that contains dopamine, oxytocin, vasopressin, testosterone, estrogen and other chemicals that most likely influence a female partner's behavior. These medications can also influence one's genetic future. Serotonin increases prolactin by stimulating prolactin releasing factors. Prolactin can impair fertility by suppressing hypothalamic GnRH release, suppressing pituitary FSH and LH release, and/or suppressing ovarian hormone production. Clomipramine, a strong serotonin-enhancing antidepressant, adversely affects sperm volume and motility. I believe that Homo sapiens has evolved (at least) three primary, distinct yet overlapping neural systems for reproduction. The sex drive evolved to motivate ancestral men and women to seek sexual union with a range of partners; romantic love evolved to enable them to focus their courtship energy on a preferred mate, thereby conserving mating time and energy; attachment evolved to enable them to rear a child through infancy together. The complex and dynamic interactions between these three brain systems suggest that any medication that changes their chemical checks and balances is likely to alter an individual's courting, mating and parenting tactics, ultimately affecting their fertility and genetic future. The reason this is a dangerous idea is that the huge drug industry is heavily invested in selling these drugs; millions of people currently take these medications worldwide; and as these drugs become generic, many more will soon imbibe — inhibiting their ability to fall in love and stay in love. And if patterns of human love subtlely change, all sorts of social and political atrocities can escalate. |
PAUL
DAVIES The fight against global warming is lost Some countries, including the United States and Australia, have been in denial about global warming. They cast doubt on the science that set alarm bells ringing. Other countries, such as the UK, are in panic, and want to make drastic cuts in greenhouse emissions. Both stances are irrelevant, because the fight is a hopeless one anyway. In spite of the recent hike in the price of oil, the stuff is still cheap enough to burn. Human nature being what it is, people will go on burning it until it starts running out and simple economics puts the brakes on. Meanwhile the carbon dioxide levels in the atmosphere will just go on rising. Even if developed countries rein in their profligate use of fossil fuels, the emerging Asian giants of China and India will more than make up the difference. Rich countries, whose own wealth derives from decades of cheap energy, can hardly preach restraint to developing nations trying to climb the wealth ladder. And without the obvious solution — massive investment in nuclear energy — continued warming looks unstoppable. Campaigners for cutting greenhouse emissions try to scare us by proclaiming that a warmer world is a worse world. My dangerous idea is that it probably won't be. Some bad things will happen. For example, the sea level will rise, drowning some heavily populated or fertile coastal areas. But in compensation Siberia may become the world's breadbasket. Some deserts may expand, but others may shrink. Some places will get drier, others wetter. The evidence that the world will be worse off overall is flimsy. What is certainly the case is that we will have to adjust, and adjustment is always painful. Populations will have to move. In 200 years some currently densely populated regions may be deserted. But the population movements over the past 200 years have been dramatic too. I doubt if anything more drastic will be necessary. Once it dawns on people that, yes, the world really is warming up and that, no, it doesn't imply Armageddon, then the international agreements like the Kyoto protocol will fall apart. The idea of giving up the global warming struggle is dangerous because it shouldn't have come to this. Mankind does have the resources and the technology to cut greenhouse gas emission. What we lack is the political will. People pay lip service to environmental responsibility, but they are rarely prepared to put their money where their mouth is. Global warming may turn out to be not so bad after all, but many other acts of environmental vandalism are manifestly reckless: the depletion of the ozone layer, the destruction of rain forests, the pollution of the oceans. Giving up on global warming will set an ugly precedent. |
APRIL
GORNIK Great art makes itself vulnerable to interpretation, which is one reason that it keeps being stimulating and fascinating for generations. The problem inherent in this is that art could inspire malevolent behavior, as per the notion popularly expressed by A Clockwork Orange. When I was young, aspiring to be a conceptual artist, it disturbed me greatly that I couldn't control the interpretation of my work. When I began painting, it was even worse; even I wasn't completely sure of what my art meant. That seemed dangerous for me, personally, at that time. I gradually came not only to respect the complexity and inscrutability of painting and art, but to see how it empowers the object. I believe that works of art are animated by their creators, and remain able to generate thoughts, feelings, responses. However, the fact is that the exact effect of art can't be controlled or fully anticipated. |
JUAN
ENRIQUEZ Technology can untie the U.S. Everyone grows and dies; same is true of countries. The only question is how long one postpones the inevitable. In the case of some countries, life spans can be very long, so it is worth asking is the U.S. in adolescence, middle age, or old age? Do science and technology accelerate or offset demise? And finally "how many stars will be in the U.S. flag in fifty years?" There has yet to be a single U.S. president buried under the same flag he was born under, yet we oft take continuity for granted. Just as almost no newlyweds expect to divorce, citizens rarely assume their beloved country, flag and anthem might end up an exhibit in an archeology museum. But countries rich and poor, Asian, African, and European have been untying time and again. In the last five decades the number of UN members has tripled. This trend goes way beyond the de-colonization of the 1960s, and it is not exclusive to failed states; it is a daily debate within the United Kingdom, Italy, France, Belgium, the Netherlands, Austria, and many others. So far the Americas has remained mostly impervious to these global trends, but, even if in God you trust, there are no guarantees. Over the next decade waves of technology will wash over the U.S. Almost any applied field you care to look at promises extraordinary change, opportunities, and challenges. (Witness the entries in this edition of Edge). How counties adapt to massive, rapid upheaval will go a long way towards determining the eventual outcome. To paraphrase Darwin, it is not the strongest, not the largest, that survive rather it is those best prepared to cope with change. It is easy to argue that the U.S. could be a larger more powerful country in fifty years. But it is also possible that, like so many other great powers, it could begin to unravel and untie. This is not something that depends on what we do decide to do fifty years hence; to a great extent it depends on what we choose to do, or choose to ignore, today. There are more than a few worrisome trends. Future ability to generate wealth depends on techno-literacy. But educational excellence, particularly in grammar and high schools is far from uniform, and it is not world class. Time and again the U.S. does poorly, particularly in regards to math and science, when compared with its major trading partners. Internally, there are enormous disparities between schools and between the number of students that pass state competency exams and what federal tests tell us about the same students. There are also large gaps in techno literacy between ethnic groups. By 2050 close to 40% of the U.S. population will be Hispanic and African American. These groups receive 3% of the PhDs in math and science today. How we prepare kids for a life sciences, materials, robotics, IT, and nanotechnology driven world is critical. But we currently invest $22,000 federal dollars in those over 65 and just over $2,000 in those under sixteen... As ethnic, age, and regional gaps in the ability to adapt increase there are many wary and frustrated by technology, open borders, free trade, and smart immigrants. Historically, when others use newfangled ways to leap ahead, it can lead to a conservative response. This is likeliest within those societies and groups thant have the most to lose, often among those who have been the most successful. One often observes a reflexive response: stop the train; I want to get off. Or, as the Red Sox now say, just wait till last year. No more teaching evolution, no more research into stem cells, no more Indian or Chinese or Mexican immigrants, no matter how smart or hardworking they might be. These individual battles are signs of a creeping xenophobia, isolationism, and fury. Within the U.S. there are many who are adapting very successfully. They tend to concentrate in a very few zip codes, life science clusters like 92121(between Salk, Scripps, and UCSD) and techno-empires like 02139 (MIT). Most of the nation's wealth and taxes are generated by a few states and, within these states, within in a few square miles. It is those who live in these areas that are most affronted by restrictions on research, the lack of science literate teenagers, and the reliance on God instead of science. Politicians well understand these divides and they have gerrymandered their own districts to reflect them. Because competitive congressional elections are rarer today than turnovers within the Soviet Politburo, there is rarely an open debate and discussion as to why other parts of the country act and think so differently. The Internet and cable further narrowcast news and views, tending to reinforce what one's neighbors and communities already believe. Positions harden. Anger at "the others" mounts. Add a large and mounting debt to this equation, along with politicized religion, and the mixture becomes explosive. The average household now owes over $88,000 and the present value of what we have promised to pay is now about $473,000. There is little willingness within Washington to address a mounting deficit, never mind the current account imbalance. Facing the next electoral challenge, few seem to remember the last act of many an empire is to drive itself into bankruptcy. Sooner or later we could witness some very bitter arguments about who gets and who pays. In developed country after developed country, it is often the richest, not the ethnically or religiously repressed, that first seek autonomy and eventually dissolution. In this context it is worth recalling that New England, not the South, has been the most secession prone region. As the country expanded, New Englanders attempted to include the right to untie into the constitution; the argument was that as this great country expanded South and West they would lose control over their political and economic destiny. Perhaps this is what led to four separate attempts to untie the Union. When we assume stability and continuity we can wake up to irreconcilable differences. Science and a knowledge driven economy can allow a few folks to build powerful and successful countries very quickly, witness Korea, Taiwan, Singapore, Ireland, but changes of this magnitude can also bury or split the formerly great who refuse to adapt, as well as those who practice bad governance. If we do not begin to address some current divides quickly we could live to see an Un-Tied States of America. |
STEPHEN
M. KOSSLYN A Science of the Divine? Here's an idea that many academics may find unsettling and dangerous: God exists. And here's another idea that many religious people may find unsettling and dangerous: God is not supernatural, but rather part of the natural order. Simply stating these ideas in the same breath invites them to scrape against each other, and sparks begin to fly. To avoid such conflict, Stephen Jay Gould famously argued that we should separate religion and science, treating them as distinct "magisteria." But science leads many of us to try to understand all that we encounter with a single, grand and glorious overarching framework. In this spirit, let me try to suggest one way in which the idea of a "supreme being" can fit into a scientific worldview. I offer the following not to advocate the ideas, but rather simply to illustrate one (certainly not the only) way that the concept of God can be approached scientifically. 1.0. First, here's the specific conception of God I want to explore: God is a "supreme being" that transcends space and time, permeates our world but also stands outside of it, and can intervene in our daily lives (partly in response to prayer). 2.0. A way to begin to think about this conception of the divine rests on three ideas: 2.1.
Emergent properties. There are many examples in science where aggregates
produce an entity that has properties that cannot be predicted entirely
from the elements themselves. For example, neurons in large numbers
produce minds; moreover, minds in large numbers produce economic, political,
and social systems. 3.0. Can we conceive of God as an emergent property of all living things that can in turn affect its constituents? Here are some ways in which this idea is consistent with the nature of God, as outlined at the outset. 3.1.
This emergent entity is "transcendent" in the sense that
it exists in no specific place or time. Like a culture or an economy,
God is nowhere, although the constituent elements occupy specific places.
As for transcending time, consider this analogy: Imagine that 1/100th
of the neurons in your brain were replaced every hour, and each old
neuron programmed a new one so that the old one's functionality was
preserved. After 100 hours your brain would be an entirely new organ
— but your mind would continue to exist as it had been before.
Similarly, as each citizen dies and is replaced by a child, the culture
continues to exist (and can grow and develop, with a "life of its
own"). So too with God. For example, in the story of Jacob's ladder,
Jacob realizes "Surely the Lord is in this place, and I
did not know it." (Genesis 28: 16) I interpret this story as illustrating
that God is everywhere but nowhere. The Ultimate Superset permeates our
world but also stands outside of (or, more specifically, "above")
it. By analogy, it's as if one of those geese became aware of the "keep near" rule, and decided to nudge the other birds in a particular direction — which thereby allows it to influence the flock's effect on itself. To the extent that prayer puts one closer to God, one's plea for intervention will have a larger impact on the way that The Ultimate Superset exerts downward causality. But note that, according to this view, God works rather slowly. Think of dropping rocks in a pond: it takes time for the ripples to propagate and eventually be reflected back from the edge, forming interference patterns in the center of the pond. 4.0. A crucial idea in monotheistic religions is that God is the Creator. The present approach may help us begin to grapple with this idea, as follows. 4.1. First, consider each individual person. The environment plays a key role in creating who and what we are because there are far too few genes to program every aspect of our brains. For example, when you were born, your genes programmed many connections in your visual areas, but did not specify the precise circuits necessary to determine how far away objects are. As an infant, the act of reaching for an object tuned the brain circuits that estimate how far away the object was from you. Similarly,
your genes graced you with the ability to acquire language, but not
with a specific language. The act of acquiring a language shapes your
brain (which in turn may make it difficult to acquire another language,
with different sounds and grammar, later in life). Moreover, cultural
practices configure the brains of members of the culture. A case in
point: the Japanese have many forms of bowing, which are difficult
for a Westerner to master relatively late in life; when we try to bow,
we "bow with an accent." In short, it is possible to begin to view the divine through the lens of science. But such reasoning does no more than set the stage; to be a truly dangerous idea, this sort of proposal must be buttressed by the results of empirical test. At present, my point is not to convince, but rather to intrigue. As much as I admired Stephen Jay Gould (and I did, very much), perhaps he missed the mark on this one. Perhaps there is a grand project waiting to be launched, to integrate the two great sources of knowledge and belief in the world today — science and religion. |
JERRY
COYNE Many behaviors of modern humans were genetically hard-wired (or soft-wired) in our distant ancestors by natural selection For
me, one idea that is dangerous and possibly true is an extreme form
of evolutionary psychology — the view that many behaviors of
modern humans were genetically hard-wired (or soft-wired) in our distant
ancestors by natural selection. But consistency arguments have two problems. First, they are not hard scientific proof. Are we satisfied that sonnets are phallic extensions simply because some male poets might have used them to lure females? Such arguments fail to meet the normal standards of scientific evidence. Second, as is well known, one can make consistency arguments for virtually every human behavior. Given the possibilities of kin selection (natural selection for behaviors that do no good for to their performers but are advantageous to their relatives) and reciprocal altruism, and our ignorance of the environments of our ancestors, there is no trait beyond evolutionary explanation. Indeed, there are claims for the evolutionary origin of even manifestly maladaptive behaviors, such as homosexuality, priestly celibacy, and extreme forms of altruism (e.g., self-sacrifice during wartime). But surely we cannot consider it scientifically proven that genes for homosexuality are maintained in human populations by kin selection. This remains possible but undemonstrated. Nevertheless, much of human behavior does seem to conform to Darwinian expectations. Males are promiscuous and females coy. We treat our relatives better than we do other people. The problem is where to draw the line between those behaviors that are so obviously adaptive that no one doubts their genesis (e.g. sleeping and eating), those which are probably but not as obviously adaptive (e.g., human sexual behavior and our fondness for fats and sweets) and those whose adaptive basis is highly speculative (e.g., the origin of art and our love of the outdoors). Although I have been highly critical of evolutionary psychology, I have not done so from political motives, nor do I think that the discipline is in principle misguided. Rather, I have been critical because evolutionary psychologists seem unwilling to draw lines between what can be taken as demonstrated and what remains speculative, making the discipline more of a faith than a science. This lack of rigor endangers the reputation of all of evolutionary biology, making our endeavors seem to be merely the concoction of ingenious stories. If we are truly to understand human nature, and use this knowledge constructively, we must distinguish the probably true from the possibly true. So, why do I see evolutionary psychology as dangerous? I think it is because I am afraid to see myself and my fellow humans as mere marionettes dancing on genetic strings. I would like to think that we have immense freedom to better ourselves as individuals and to create a just and egalitarian society. Granted, genetics is not destiny, but neither are we completely free of our evolutionary baggage. Might genetics really hold a leash on our capacity to change? If so, then some claims of evolutionary psychology give us convenient but dangerous excuses for behaviors that seem unacceptable. It is all too easy, for example, for philandering males to excuse their behavior as evolutionarily justified. Evolutionary psychologists argue that it is possible to overcome our evolutionary heritage. But what if it is not so easy to take the Dawkinsian road and "rebel against the tyranny of the selfish replicators"? |
ERNST
PÖPPEL My belief in science Average life expectancy of a species on this globe is just a few million years. From an external point of view, it would be nothing special if humankind suddenly disappears. We have been here for sometime. With humans no longer around, evolutionary processes would have an even better chance to fill in all those ecological niches which have been created by human activities. As we change the world, and as thousands of species are lost every year because of human activities, we provide a new and productive environment for the creation of new species. Thus, humankind is very creative with respect to providing a frame for new evolutionary trajectories, and humankind would even be more creative, if it has disappeared altogether. If somebody (unfortunately not our descendents) would visit this globe some time later, they would meet many new species, which owe their existence the presence and the disappearance of humankind. But this is not going to happen, because we are doing science. With science we apparently get a better understanding of basic principles in nature, we have a chance to improve quality of life, and we can develop means to extend the life expectancy of our species. Unfortunately, some of these scientific activities have a paradoxical effect resulting in a higher risk for a common disappearance. Maybe, science will not be so effective after all to prevent our disappearance. Only now comes my dangerous idea as my (!) dangerous idea. It is not so difficult to come up with a dangerous scenario on a general level, but if one takes such a question also seriously on a personal level, one has to meditate an individual scenario. I am very grateful for this question formulated by Steven Pinker as it forced me to visit my episodic memory and to think about what has been and still is "my dangerous idea". Although nobody else might be interested in a personal statement, I say it anyway: My dangerous idea is my belief in science. In all my research (in the field of temporal perception or visual processes) I have a basic trust in the scientific activities, and I actually believe the results I have obtained. And I believe the results of others. But why? I know that there so many unknown and unknowable variables that are part of the experimental setup and which cannot be controlled. How can I trust in spite of so many unknowables (does this word exist in English?)? Furthermore, can I really rely on my thinking, can I trust my eyes and ears? Can I be so sure about my scientific activities that I communicate with pride the results to others? If I look at the complexity of the brain, how is it possible that something reasonable comes out of this network? How is it possible that a face that I see or a thought that I have maintain their identity over time? If I have no access to what goes on in my brain, how can I be so proud, (how can anybody be so proud) about scientific achievements? |
GEOFFREY
MILLER Runaway consumerism explains the Fermi Paradox The story goes like this: Sometime in the 1940s, Enrico Fermi was talking about the possibility of extra-terrestrial intelligence with some other physicists. They were impressed that our galaxy holds 100 billion stars, that life evolved quickly and progressively on earth, and that an intelligent, exponentially-reproducing species could colonize the galaxy in just a few million years. They reasoned that extra-terrestrial intelligence should be common by now. Fermi listened patiently, then asked simply, "So, where is everybody?". That is, if extra-terrestrial intelligence is common, why haven't we met any bright aliens yet? This conundrum became known as Fermi's Paradox. The paradox has become more ever more baffling. Over 150 extrasolar planets have been identified in the last few years, suggesting that life-hospitable planets orbit most stars. Paleontology shows that organic life evolved very quickly after earth's surface cooled and became life-hospitable. Given simple life, evolution shows progressive trends towards larger bodies, brains, and social complexity. Evolutionary psychology reveals several credible paths from simpler social minds to human-level creative intelligence. Yet 40 years of intensive searching for extra-terrestrial intelligence have yielded nothing. No radio signals, no credible spacecraft sightings, no close encounters of any kind. So, it looks as if there are two possibilities. Perhaps our science over-estimates the likelihood of extra-terrestrial intelligence evolving. Or, perhaps evolved technical intelligence has some deep tendency to be self-limiting, even self-exterminating. After Hiroshima, some suggested that any aliens bright enough to make colonizing space-ships would be bright enough to make thermonuclear bombs, and would use them on each other sooner or later. Perhaps extra-terrestrial intelligence always blows itself up. Fermi's Paradox became, for a while, a cautionary tale about Cold War geopolitics. I suggest a different, even darker solution to Fermi's Paradox. Basically, I think the aliens don't blow themselves up; they just get addicted to computer games. They forget to send radio signals or colonize space because they're too busy with runaway consumerism and virtual-reality narcissism. They don't need Sentinels to enslave them in a Matrix; they do it to themselves, just as we are doing today. The fundamental problem is that any evolved mind must pay attention to indirect cues of biological fitness, rather than tracking fitness itself. We don't seek reproductive success directly; we seek tasty foods that tended to promote survival and luscious mates who tended to produce bright, healthy babies. Modern results: fast food and pornography. Technology is fairly good at controlling external reality to promote our real biological fitness, but it's even better at delivering fake fitness — subjective cues of survival and reproduction, without the real-world effects. Fresh organic fruit juice costs so much more than nutrition-free soda. Having real friends is so much more effort than watching Friends on TV. Actually colonizing the galaxy would be so much harder than pretending to have done it when filming Star Wars or Serenity. Fitness-faking technology tends to evolve much faster than our psychological resistance to it. The printing press is invented; people read more novels and have fewer kids; only a few curmudgeons lament this. The Xbox 360 is invented; people would rather play a high-resolution virtual ape in Peter Jackson's King Kong than be a perfect-resolution real human. Teens today must find their way through a carnival of addictively fitness-faking entertainment products: MP3, DVD, TiVo, XM radio, Verizon cellphones, Spice cable, EverQuest online, instant messaging, Ecstasy, BC Bud. The traditional staples of physical, mental, and social development (athletics, homework, dating) are neglected. The few young people with the self-control to pursue the meritocratic path often get distracted at the last minute — the MIT graduates apply to do computer game design for Electronics Arts, rather than rocket science for NASA. Around 1900, most inventions concerned physical reality: cars, airplanes, zeppelins, electric lights, vacuum cleaners, air conditioners, bras, zippers. In 2005, most inventions concern virtual entertainment — the top 10 patent-recipients are usually IBM, Matsushita, Canon, Hewlett-Packard, Micron Technology, Samsung, Intel, Hitachi, Toshiba, and Sony — not Boeing, Toyota, or Wonderbra. We have already shifted from a reality economy to a virtual economy, from physics to psychology as the value-driver and resource-allocator. We are already disappearing up our own brainstems. Freud's pleasure principle triumphs over the reality principle. We narrow-cast human-interest stories to each other, rather than broad-casting messages of universal peace and progress to other star systems. Maybe the bright aliens did the same. I suspect that a certain period of fitness-faking narcissism is inevitable after any intelligent life evolves. This is the Great Temptation for any technological species — to shape their subjective reality to provide the cues of survival and reproductive success without the substance. Most bright alien species probably go extinct gradually, allocating more time and resources to their pleasures, and less to their children. Heritable variation in personality might allow some lineages to resist the Great Temptation and last longer. Those who persist will evolve more self-control, conscientiousness, and pragmatism. They will evolve a horror of virtual entertainment, psychoactive drugs, and contraception. They will stress the values of hard work, delayed gratification, child-rearing, and environmental stewardship. They will combine the family values of the Religious Right with the sustainability values of the Greenpeace Left. My dangerous idea-within-an-idea is that this, too, is already happening. Christian and Muslim fundamentalists, and anti-consumerism activists, already understand exactly what the Great Temptation is, and how to avoid it. They insulate themselves from our Creative-Class dream-worlds and our EverQuest economics. They wait patiently for our fitness-faking narcissism to go extinct. Those practical-minded breeders will inherit the earth, as like-minded aliens may have inherited a few other planets. When they finally achieve Contact, it will not be a meeting of novel-readers and game-players. It will be a meeting of dead-serious super-parents who congratulate each other on surviving not just the Bomb, but the Xbox. They will toast each other not in a soft-porn Holodeck, but in a sacred nursery. |
ROBERT
SHAPIRO We
shall understand the origin of life within the next 5 years Just over a half century ago, in the spring of 1953, a famous experiment brought enthusiasm and renewed interest to this field. Stanley Miller, mentored by Harold Urey, demonstrated that a mixture of small organic molecules (monomers) could readily be prepared by exposing a mixture of simple gases to an electrical spark. Similar mixtures were found in meteorites, which suggested that organic monomers may be widely distributed in the universe. If the ingredients of life could be made so readily, then why could they not just as easily assort themselves to form cells? In that same spring, however, another famous paper was published by James Watson and Francis Crick. They demonstrated that the heredity of living organisms was stored in a very large large molecule called DNA. DNA is a polymer, a substance made by stringing many smaller units together, as links are joined to form a long chain. The clear connection between the structure of DNA and its biological function, and the geometrical beauty of the DNA double helix led many scientists to consider it to be the essence of life itself. One flaw remained, however, to spoil this picture. DNA could store information, but it could not reproduce itself without the assistance of proteins, a different type of polymer. Proteins are also adept at increasing the rate of (catalyzing) many other chemical reactions that are considered necessary for life. The origin of life field became mired in the "chicken-or-the egg" question. Which came first: DNA or proteins? An apparent answer emerged when it was found that another polymer, RNA (a cousin of DNA) could manage both heredity and catalysis. In 1986, Walter Gilbert proposed that life began with an "RNA World." Life started when an RNA molecule that could copy itself was formed, by chance, in a pool of its own building blocks. Unfortunately, a half century of chemical experiments have demonstrated that nature has no inclination to prepare RNA, or even the building blocks (nucleotides) that must be linked together to form RNA. Nucleotides are not formed in Miller-type spark discharges, nor are they found in meteorites. Skilled chemists have prepared nucleotides in well-equipped laboratories, and linked them to form RNA, but neither chemists nor laboratories were present when life began on the early Earth. The Watson-Crick theory sparked a revolution in molecular biology, but it left the origin-of-life question at an impasse. Fortunately, an alternative solution to this dilemma has gradually emerged: neither DNA nor RNA nor protein were necessary for the origin of life. Large molecules dominate the processes of life today, but they were not needed to get it started. Monomers themselves have the ability to support heredity and catalysis. The key requirement is that a suitable energy source be available to assist them in the processes of self-organization. A demonstration of the principle involved in the origin of life would require only that a suitable monomer mixture be exposed to an appropriate energy source in a simple apparatus. We could then observe the very first steps in evolution. Some mixtures will work, but many others will fail, for technical reasons. Some dedicated effort will be needed in the laboratory to prove this point. Why have I specified five years for this discovery? The unproductive polymer-based paradigm is far from dead, and continues to consume the efforts of the majority of workers in the field. A few years will be needed to entice some of them to explore the other solution. I estimate that several years more (the time for a PhD thesis) might be required to identify a suitable monomer-energy combination, and perform a convincing demonstration. Who would be disturbed if such efforts should succeed? Many scientists have been attracted by the RNA World theory because of its elegance and simplicity. Some of them have devoted decades of their career in efforts to prove it. They would not be pleased if Freeman Dyson's description proved to be correct: "life began with little bags, the precursors of cells, enclosing small volumes of dirty water containing miscellaneous garbage." A very different group would find this development as dangerous as the theory of evolution. Those who advocate creationism and intelligent design would feel that another pillar of their belief system was under attack. They have understood the flaws in the RNA World theory, and used them to support their supernatural explanation for life's origin. A successful scientific theory in this area would leave one less task less for God to accomplish: the origin of life would be a natural (and perhaps frequent) result of the physical laws that govern this universe. This latter thought falls directly in line with the idea of Cosmic Evolution, which asserts that events since the Big Bang have moved almost inevitably in the direction of life. No miracle or immense stroke of luck was needed to get it started. If this should be the case, then we should expect to be successful when we search for life beyond this planet. We are not the only life that inhabits this universe. |
KAI
KRAUSE Dangerous Ideas? It is dangerous ideas you want? From this group of people ? That in itself ought to be nominated as one of the more dangerous ideas... Danger is ubiquitous. If recent years have shown us anything, it should be that "very simple small events can cause real havoc in our society". A few hooded youths play cat and mouse with the police: bang, thousands of burned cars put all of Paris into a complete state of paralysis, mandatory curfew and the entire system in shock and horror. My first thought was: what if any really smart set of people really set their mind to it...how utterly and scarily trivial it would be, to disrupt the very fabric of life, to bring society to a dead stop? The
relative innocence and stable period of the last 50 years may spiral
into a nearly inevitable exposure to real chaos. What if it isn't haphazard
testosterone driven riots, where they cannibalize their own neighborhood,
much like in L.A. in the 80s, but someone with real insight behind
that criminal energy ? What if Slashdotters start musing aloud about "Gee,
the L.A. water supply is rather simplistic, isn't it?" An Open
Source crime web, a Wiki for real WTO opposition ? Hacking L.A. may
be a lot easier than hacking IE. In fact, I will broaden the specter still: its not violent crime and global terrorism I worry about, as much as the basic underpinning of our entire civilization coming apart, as such. No acts of malevolence, no horrible plans by evil dark forces, neither the singular "Bond Nemesis" kind, nor masses of religious fanatics. None of that needed... It is the glue that is coming apart to topple this tower. And no, I am not referring to "spiraling trillions of debt". No,
what I am referring to is a slow process I observed over the last 30
years, ever since in my teens I wondered "How would this world
work, if everyone were like me ?" and realized: it wouldn't ! That was the wondrous introspection in adolescent phases, searching for a place in the jigsaw puzzle. But in recent years, the haunting question has come back to me: "How the hell does this world function at all? And does it, really ? I feel an alienation zapping through the channels, I can't find myself connecting with those groups of humanoids trouncing around MTV. Especially the glimpses of "real life": on daytime-courtroom-dramas or just looking at faces in the street. On every scale, the closer I observe it, the more the creeping realization haunts me: individuals, families, groups, neighborhoods, cities, states, countries... they all just barely hang in there, between debt and dysfunction. The whole planet looks like Any town with mini malls cutting up the landscape and just down the road it's all white trash with rusty car wrecks in the back yard. A huge Groucho Club I don't want to be a member of. But it does go further: what is particularly disturbing to see is this desperate search for Individualism that has rampantly increased in the last decade or so. Everyone suddenly needs to be so special, be utterly unique. So unique that they race off like lemmings to get 'even more individual' tattoos, branded cattle, with branded chains in every mall, converging on a blanded sameness world wide, but every rap singer with ever more gold chains in ever longer stretched limos is singing the tune: Don't be a loser! Don't be normal! The desperation with which millions of youngsters try to be that one-in-a-million professional ball player may have been just a "sad but silly factoid" for a long time. But now the tables are turning: the anthill is relying on the behaviour of the ants to function properly. And that implies: the social behaviour, the role playing, taking defined tasks and follow them through. What if each ant suddenly wants to be the queen? What if soldiering and nest building and cleaning chores is just not cool enough any more? If AntTV shows them every day nothing but un-Ant behaviour...? In my youth we were whining about what to do and how to do it, but in the end,all of my friends did become "normal" humans, orthopedics and lawyers, social workers, teachers... There were always a few that lived on the edges of normality, like ending up as television celebrities, but on the whole: they were perfectly reasonable ants. 1.8 children, |
Mankind's
increasing understanding of the way genes
influence behaviour and the issue's potential
to cause ethical and moral dilemmas is
one of the biggest dangers facing society,
according to leading scientists. The concerns
were voiced as part of an exercise by the
web magazine Edge, which asked more than
100 scientists and philosophers: "What
is your dangerous idea?". The responses
were published online yesterday.
describes
the thickness of a stable bell curve and ranges
from 0 to 2. Tails grow thicker as 
grows
smaller. The white noise grows more impulsive
as the tails grow thicker. The Gaussian or normal
bell curve
has
the thinnest tail of the four stable curves
while the Cauchy bell curve 
has
the thickest tails and thus the most impulsive
noise. Note the different magnitude scales
on the vertical axes. All the bell curves
have finite dispersion while only the Gaussian
or normal bell curve has a finite variance or
finite standard deviation.
