Wednesday, May 04, 2011

New Yorker article on the Brain and Our Sense of Time

The Possibilian
What a brush with death taught David Eagleman about the mysteries of time and the brain.
by Burkhard Bilger April 25, 2011

When David Eagleman was eight years old, he fell off a roof and kept on falling. Or so it seemed at the time. His family was living outside Albuquerque, in the foothills of the Sandia Mountains. There were only a few other houses around, scattered among the bunchgrass and the cholla cactus, and a new construction site was the Eagleman boys’ idea of a perfect playground. David and his older brother, Joel, had ridden their dirt bikes to a half-finished adobe house about a quarter of a mile away. When they’d explored the rooms below, David scrambled up a wooden ladder to the roof. He stood there for a few minutes taking in the view—west across desert and subdivision to the city rising in the distance—then walked over the newly laid tar paper to a ledge above the living room. “It looked stiff,” he told me recently. “So I stepped onto the edge of it.”

In the years since, Eagleman has collected hundreds of stories like his, and they almost all share the same quality: in life-threatening situations, time seems to slow down. He remembers the feeling clearly, he says. His body stumbles forward as the tar paper tears free at his feet. His hands stretch toward the ledge, but it’s out of reach. The brick floor floats upward—some shiny nails are scattered across it—as his body rotates weightlessly above the ground. It’s a moment of absolute calm and eerie mental acuity. But the thing he remembers best is the thought that struck him in midair: this must be how Alice felt when she was tumbling down the rabbit hole.

Eagleman is thirty-nine now and an assistant professor of neuroscience at Baylor College of Medicine, in Houston. Physically, he seems no worse for the fall. He did a belly flop on the bricks, he says, and his nose took most of the impact. “He made a one-point landing,” as his father puts it. The cartilage was so badly smashed that an emergency-room surgeon had to remove it all, leaving Eagleman with a rubbery proboscis that he could bend in any direction. But it stiffened up eventually, and it’s hard to tell that it was ever injured. Eagleman has puckish, neatly carved features, with a lantern jaw and modish sideburns. In Baylor’s lab-coated corridors, he wears designer jeans and square-toed ankle boots, and walks with a bounce in his step that’s suspiciously close to a strut, like Pinocchio heading off to Pleasure Island.

If Eagleman’s body bears no marks of his childhood accident, his mind has been deeply imprinted by it. He is a man obsessed by time. As the head of a lab at Baylor, Eagleman has spent the past decade tracing the neural and psychological circuitry of the brain’s biological clocks. He has had the good fortune to arrive in his field at the same time as fMRI scanners, which allow neuroscientists to observe the brain at work, in the act of thinking. But his best results have often come through more inventive means: video games, optical illusions, physical challenges. Eagleman has a talent for testing the untestable, for taking seemingly sophomoric notions and using them to nail down the slippery stuff of consciousness. “There are an infinite number of boring things to do in science,” he told me. “But we live these short life spans. Why not do the thing that’s the coolest thing in the world to do?”

A few years ago, Eagleman thought back on his fall from the roof and decided that it posed an interesting research question. Why does time slow down when we fear for our lives? Does the brain shift gears for a few suspended seconds and perceive the world at half speed, or is some other mechanism at work? The only way to know for sure was to re-create the situation in a controlled setting. Eagleman and one of his graduate students, Chess Stetson, who is now at Caltech, began by designing and programming a “perceptual chronometer.” About the size of a pack of cards, it had an L.E.D. display connected to a circuit board and powered by a nine-volt battery. The unit could be strapped to a subject’s wrist, where it would flash a number at a rate just beyond the threshold of perception. If time slowed down, Eagleman reasoned, the number would become visible. Now he just needed a good, life-threatening situation.

Early this winter, I joined Eagleman in London for his most recent project: a study of time perception in drummers. Timing studies tend to be performed on groups of random subjects or on patients with brain injuries or disorders. They’ve given us a good sense of average human abilities, but not the extremes: just how precise can a person’s timing be? “In neuroscience, you usually look for animals that are best at something,” Eagleman told me, over dinner at an Italian restaurant in Notting Hill. “If it’s memory, you study songbirds; if it’s olfaction, you look at rats and dogs. If I were studying athletes, I’d want to find the guy who can run a four-minute mile. I wouldn’t want a bunch of chubby high-school kids.”

The idea of studying drummers had come from Brian Eno, the composer, record producer, and former member of the band Roxy Music. Over the years, Eno had worked with U2, David Byrne, David Bowie, and some of the world’s most rhythmically gifted musicians. He owned a studio a few blocks away, in a converted stable on a cobblestoned cul-de-sac, and had sent an e-mail inviting a number of players to participate in Eagleman’s study. “The question is: do drummers have different brains from the rest of us?” Eno said. “Everyone who has ever worked in a band is sure that they do.”

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1 comment:

Anonymous said...

Eagleman imparts the disconcerting impression that he desires to be yet another new age charlatan with a cult of eager devotees, not a scientist. "Possibilianism" is mere Scientology with a bit more science injected into it. As our world becomes increasingly secular and scientific, it is important to remember that narcissism is a feeble replacement for the ultimate truth: love your neighbor as yourself. If you trust in science to give you the answers to religion, religion can just as easily answer your questions about science.