Why A Brush With Death Triggers The Slow-Mo Effect : NPR   Leave a comment

“David Eagleman is now Dr. Eagleman, a neuroscientist at Baylor College of Medicine, and one of his specialties is exploring how our brains perceive and understand time.

Several years ago, motivated in part by his childhood plunge, David started studying the way our sense of time distorts in crisis situations. He has gathered a huge number of stories from people who have survived falls, car crashes, bike accidents, etc. Everyone, he says, seems to say the same thing: “It felt like the world was moving in slow motion.”

But what is really going on? David started to think that maybe, in a crisis, the brain goes into a sort of turbo mode, processing everything at higher-than-normal-speed. If the brain were to speed up, he thought, the world would appear to slow down. This would work just like a slow-motion movie; in a slow-mo shot of a hummingbird, for example, you can see each individual wing movement in what would otherwise be just a blur.

Taking The Plunge

So David decided to craft an experiment to study this “slow-motion effect” in action. But to do that, he had to make people fear for their lives — without actually putting them in danger. His first attempt involved a field trip to Six Flags AstroWorld, an amusement park in Houston, Texas. He used his students as his subjects. “We went on all of the scariest roller coasters, and we brought all of our equipment and our stopwatches, and had a great time,” David says. “But it turns out nothing there was scary enough to induce this fear for your life that appears to be required for the slow-motion effect.”

But, after a little searching, David discovered something called SCAD diving. (SCAD stands for Suspended Catch Air Device.) It’s like bungee jumping without the bungee. Imagine being dangled by a cable about 150 feet off the ground, facing up to the sky. Then, with a little metallic click, the cable is released and you plummet backward through the air, landing in a net (hopefully) about 3 seconds later.

SCAD diving was just what David needed — it was definitely terrifying. But he also needed a way to judge whether his subjects’ brains really did go into turbo mode. So, he outfitted everybody with a small electronic device, called a perceptual chronometer, which is basically a clunky wristwatch. It flashes numbers just a little too fast to see. Under normal conditions — standing around on the ground, say — the numbers are just a blur. But David figured, if his subjects’ brains were in turbo mode, they would be able to read the numbers.”

via Why A Brush With Death Triggers The Slow-Mo Effect : NPR.

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Posted January 14, 2012 by arnoneumann in Neuroscience

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