Scientists compared the genetic sequences of ethnically and geographically diverse people from around the world and found that the genes which code for the nervous systems, had some sequence differences (known as polymorphisms) among individuals. By analyzing human and chimpanzee polymorphism patterns, genetic probabilities and various other genetic tools, and geographical distributions, they found evidence that some of these genes are experiencing ongoing positive selection in humans. They calculated that one genetic variant of microcephalin arose approximately 37,000 years ago, which coincides with the emergence of culturally modern humans, and it increased in frequency too rapidly to be compatible with random genetic drift or population migration. This suggests that it underwent positive selection.[xxi] An ASPM variant arose about 5800 years ago, coincident with the spread of agriculture, cities and the first record of written language. It too is found in such high frequencies in the population, that it indicates strong positive selection.[xxii]

MICHAEL GAZZANIGA, one of the world's leading neuroscientists, is a Professor of Psychology and the Director for the SAGE Center for the Study of Mind at the University of California Santa Barbara, and is a member of the President’s Council on Bioethics.

He is the author of several books including Human: The Science Behind What Makes Us Unique (Ecco; June 24, 2008).

Michael Gazzaniga's Edge Bio Page

It is customary to think about fashions in things like clothes or music as spreading in a social network. But it turns out that all kinds of things, many of them quite unexpected, can flow through social networks, and this process obeys certain rules we are seeking to discover.  We've been investigating the spread of obesity through a network, the spread of smoking cessation through a network, the spread of happiness through a network, the spread of loneliness through a network, the spread of altruism through a network.  And we have been thinking about these kinds of things while also keeping an eye on the fact that networks do not just arise from nothing or for nothing.  Very interesting rules determine their structure.  

Introduction

On of the oft-repeated phrases on Edge is "New Technologies=New Perceptions". As we create tools we recreate ourselves. In the digital information age, we have moved from thinking about silicon, transistors, and microprocessors, to redefining, to the edge of creating life itself. As we have seen in recent editions of Edge — "Life: What A Concept!" (Freeman Dyson, Craig Venter, George Church, Robert Shapiro, Dimitar Sasselov, Seth Lloyd) at Eastover Farm in August, "Life: A Gene-Centric View" (Richard Dawkins and Craig Venter) in Munich in January; "Engineering Biology" (Drew Endy) in our most recent edition — we are redefining who and what we are.

Such scientific explorations are not limited to biology. Recently, Harvard professor and sociologist Nicholas Christakis has shown that there's more to think about regarding social networks such as Facebook, MySpace, Flickr, and Twitter than considerations of advertising and revenue models. According to The New York Times , ("On Facebook, Scholars Link Up With Data", by Stephanie Rosenbloom 12.17.07):

Each day about 1,700 juniors at an East Coast college log on to Facebook.com to accumulate "friends," compare movie preferences, share videos and exchange cybercocktails and kisses. Unwittingly, these students have become the subjects of academic research. To study how personal tastes, habits and values affect the formation of social relationships (and how social relationships affect tastes, habits and values), a team of researchers from Harvard and the University of California, Los Angeles, are monitoring the Facebook profiles of an entire class of students at one college, which they declined to name because it could compromise the integrity of their research.

Christakis notes that he is "interested not in biological contagion, but in social contagion. One possible mechanism is that I observe you and you begin to display certain behaviors that I then copy. For example, you might start running and then I might start running. Or you might invite me to go running with you. Or you might start eating certain fatty foods and I might start copying that behavior and eat fatty foods. Or you might take me with you to restaurants where I might eat fatty foods. What spreads from person to person is a behavior, and it is the behavior that we both might exhibit that then contributes to our changes in body size. So, the spread of behaviors from person to person might cause or underlie the spread of obesity."

In a page one story in The New York Times last summer ("Find Yourself Packing It On? Blame Friends" 7.26.07), Gina Kolata noted:

Obesity can spread from person to person, much like a virus, researchers are reporting today. When one person gains weight, close friends tend to gain weight, too.

Their study, published in The New England Journal of Medicine, involved a detailed analysis of a large social network of 12,067 people who had been closely followed for 32 years, from 1971 to 2003.

The investigators knew who was friends with whom as well as who was a spouse or sibling or neighbor, and they knew how much each person weighed at various times over three decades. That let them reconstruct what happened over the years as individuals became obese. Did their friends also become obese? Did family members? Or neighbors?

The answer, the researchers report, was that people were most likely to become obese when a friend became obese. That increased a person's chances of becoming obese by 57 percent. There was no effect when a neighbor gained or lost weight, however, and family members had less influence than friends.

It did not even matter if the friend was hundreds of miles away, the influence remained. And the greatest influence of all was between close mutual friends. There, if one became obese, the other had a 171 percent increased chance of becoming obese, too. ...

Christakis, along with his colleague James Fowler, "have started with several projects that seek to understand the processes of contagion, and we have also begun a body of work looking at the processes of network formation — how structure starts and why it changes. We have made some empirical discoveries about the nature of contagion within networks. And also, in the latter case, with respect to how networks arise, we imagine that the formation of networks obeys certain fundamental biological, genetic, physiological, sociological, and technological rules. "

"So we have been investigating both what causes networks to form and how networks operate."

— JB

NICHOLAS A. CHRISTAKIS, a physician and sociologist, is a Professor at Harvard University with joint appointments in the Departments of Health Care Policy, Sociology, and Medicine. For the last ten years, he has been studying social networks.

Nicholas Christakis's Edge Bio Page

THE REALITY CLUB: Douglas Rushkoff, Alan Alda Nicholas Christakis

BANAJI: What is remarkable about this test, which is called the Implicit Association Test—the IAT—is that it allows you to be a subject in your own experiment. Most scientists do not have the remarkable experience of being the object of study in their own research.

GREENWALD: The IAT provides a useful window into some otherwise difficult-to-detect contents of our minds. In some cases, we find things we did not know were there. It may be "an inconvenient truth" that what's there is not what we thought was there or want to be there. But I think it is generally something we can come to grips with.

[Click here to take the "PRESIDENTIAL CANDIDATES IAT"]

MAHZARIN BANAJI, psychologist, is Richard Clarke Cabot Professor of Social Ethics, Harvard University. ANTHONY GREENWALD is Professor of Psychology, University of Washington.

Mahzarin Banaji's Edge Bio Page
Anthony Greenwald's Edge Bio Page

[14:04 minutes]

It might seem obvious to you that contractual societies are good, modern, creative and free, whereas beehive societies reek of feudalism, fascism, and patriarchy. And, as a secular liberal I agree that contractual societies such as those of Western Europe offer the best hope for living peacefully together in our increasingly diverse modern nations (although it remains to be seen if Europe can solve its current diversity problems).

I just want to make one point, however, that should give contractualists pause: surveys have long shown that religious believers in the United States are happier, healthier, longer-lived, and more generous to charity and to each other than are secular people.

JONATHAN HAIDT is Associate Professor of Psychology at the University of Virginia, where he does research on morality and emotion and how they vary across cultures. He is the author of The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom.

Jonathan Haidt's Edge Bio Page

THE REALITY CLUB: David Sloan Wilson, Michael Shermer, Sam Harris, PZ Myers, Marc D. Hauser; Jonathan Haidt responds 

A SHORT COURSE IN THINKING ABOUT THINKING
Edge Master Class 2007

AN EDGE SPECIAL PROJECT
Auberge du Soleil, Rutherford, CA, July 20-22, 2007

(click for slideshow)

PARTICIPANTS: Daniel Kahneman, Psychologist; Nobel Laureate, Princeton University; Sergey Brin, Founder, Google; Stewart Brand, Co-founder, Long Now Foundation, Author, How Buildings Learn; George Dyson, Science Historian; Author, Darwin Among the Machines; Salar Kamangar, Google; Jimmy Wales, Founder, Chair, Wikimedia Foundation (Wikipedia); George Smoot, Physicist, Nobel Laureate, Berkeley, Co-author, Wrinkles In Time; W. Daniel Hillis, Computer Scientist; Co-founder, Applied Minds; Author, The Pattern on the Stone; Dean Kamen, Inventor, Deka Research; Peter Diamandis, Space Entrepreneur, Founder, X Prize Foundation; Nathan Myhrvold, Physicist; Founder, Intellectual Venture, LLC; Event Photographer; Katinka Matson, Co-founder, Edge Foundation, Inc.; Jeff Bezos, Founder, Amazon.com; Larry Page, Founder, Google; John Brockman, Edge Foundation, Inc.; Max Brockman, Brockman, Inc.; Seth Lloyd, Quantum Physicist, MIT, Author, Programming The Universe;  Tim O'Reilly, Founder, O'Reilly Media;  Anne Treisman, Psychologist, Princeton University.

INTRODUCTION
By John Brockman

Recently, I spent several months working closely with Danny Kahneman, the psychologist who is the co-creator of behavioral economics (with his late collaborator Amos Tversky), for which he won the Nobel Prize in Economics in 2002.

My discussions with him inspired a 2-day "Master Class" given by Kahneman for a group of twenty leading American business/Internet/culture innovators—a microcosm of the recently dominant sector of American business—in Napa, California in July. They came to hear him lecture on his ideas and research in diverse fields such as human judgment, decision making and behavioral economics and well-being.

Dean Kamen

Jeff Bezos

Larry Page

While Kahneman has a wide following among people who study risk, decision-making, and other aspects of human judgment, he is not exactly a household name. Yet among many of the top thinkers in psychology, he ranks at the top of the field.

Harvard psychologist Daniel Gilbert (Stumbling on Happiness) writes: "Danny Kahneman is simply the most distinguished living psychologist in the world, bar none. Trying to say something smart about Danny's contributions to science is like trying to say something smart about water: It is everywhere, in everything, and a world without it would be a world unimaginably different than this one." And according to Harvard's Steven Pinker (The Stuff of Thought): "It's not an exaggeration to say that Kahneman is one of the most influential psychologists in history and certainly the most important psychologist alive today. He has made seminal contributions over a wide range of fields including social psychology, cognitive science, reasoning and thinking, and behavioral economics, a field he and his partner Amos Tversky invented."

Jimmy Wales

Nathan Myhrvold

Stewart Brand

Here are some examples from the national media which illustrate how Kahneman's ideas are reflected in the public conversation:

In the Economist "Happiness & Economics " issue in December, 2006, Kahneman is credited with the new hedonimetry regarding his argument that people are not as mysterious as less nosy economists supposed. "The view that hedonic states cannot be measured because they are private events is widely held but incorrect."

Paul Krugman, in his New York Times column, "Quagmire Of The Vanities" (January 8, 2007), asks if the proponents of the "surge" in Iraq are cynical or delusional. He presents Kahneman's view that "the administration's unwillingness to face reality in Iraq reflects a basic human aversion to cutting one's losses—the same instinct that makes gamblers stay at the table, hoping to break even."

His articles have been picked up by the press and written about extensively. The most recent example is Jim Holt's lede piece in The New York Times Magazine, "You are What You Expect" (January 21, 2007), an article about this year's Edge Annual Question "What Are You Optimistic About?" It was prefaced with a commentary regarding Kahneman's ideas on "optimism bias."

In Jerome Groopman's New Yorker article, "What's the trouble? How Doctors Think" (January 29, 2007), Groopman looks at a medical misdiagnosis through the prism of a heuristic called "availability," which refers to the tendency to judge the likelihood of an event by the ease with which relevant examples come to mind. This tendency was first described in 1973, in Kahneman's paper with Amos Tversky when they were psychologists at the Hebrew University of Jerusalem.

Kahneman's article (with Jonathan Renshon) "Why Hawks Win" was published in Foreign Policy (January/February 2007); Kahneman points out that the answer may lie deep in the human mind. People have dozens of decision-making biases, and almost all favor conflict rather than concession. The article takes a look at why the tough guys win more than they should. Publication came during the run up to Davis, and the article became a focus of numerous discussions and related articles.

The event was an unqualified success. As one of the attendees later wrote: "Even with the perspective a few weeks, I can still think it is one of the all time best conferences that I have ever attended."

George Smoot

Daniel Kahneman

Sergey Brin

Over a period of two days, Kahneman presided over six sessions lasting about eight hours. The entire event was videotaped as an archive. Edge is pleased to present a sampling from the event consisting of streaming video of the first 10-15 minutes of each session along with the related verbatim transcripts.

—JB

DANIEL KAHNEMAN is Eugene Higgins Professor of Psychology, Princeton University, and Professor of Public Affairs, Woodrow Wilson School of Public and International Affairs. He is winner of the 2002 Nobel Prize in Economic Sciences for his pioneering work integrating insights from psychological research into economic science, especially concerning human judgment and decision-making under uncertainty.

Daniel Kahneman's Edge Bio Page
Daniel Kahneman's Nobel Prize Lecture

As I look through the structure of the words and the structure of the sentences, it just becomes clear that they don't have recursion. If recursion is what Chomsky and Mark Hauser and Tecumseh Fitch have called "the essential property of language," the essential building block—in fact they've gone so far as to claim that that might be all there really is to human language that makes it different from other kinds of systems—then, the fact that recursion is absent in a language—Pirahã—means that this language is fundamentally different from their predictions.

DANIEL L. EVERETT, a former evangelical Christian missionary to the Pirahãs in the Brazilian Amazon for more than 20 years, is chair of languages, literatures, and cultures and professor of linguistics and anthropology at Illinois State University. Dan Everett's Edge Bio Page

The Reality Club: Steven Pinker, Dan Everett, Robert D. Van Valin, Jr., David Pesetsky, Dan Everett