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How to See Without Looking

June 6th, 2007 Medgadget Editors News

The likes of Wayne Gretzky, Michael Jordan, and Diego Maradona, besides their athletic ability, have an incredible sense of the players around them, which allowed them to display incredible plays in their respective sports. Peter Vint is a researcher at the US Olympic Committee, and showed Wired his research on how great players quickly adapt to their environments and how this can be taught to others.

To understand what experts were seeing, Farrow meticulously dismantled the mechanics of the serve. He recruited two groups of players — novices and experts — and outfitted each with earmuffs and occlusion goggles, clear glasses that turn opaque when an assistant on the sidelines flips an electronic switch. He then put the athletes on court opposite an expert server. As the server’s arm went back for the shot, Farrow would black out the goggles, leaving players to swing blindly at the incoming ball…
Not surprisingly, receivers were better at guessing the ball’s direction the later their vision cut out. But the results also revealed something more interesting. Graphs of the amateurs’ reactions showed that they could anticipate where the ball would go only if they witnessed the racket making contact with it. Experts knew what would happen roughly a third of a second earlier, when the server’s cocked arm was still unfolding.
What happened in that fraction of a second? A lot, Farrow reasoned. Up to a point, he theorized, the direction of a serve was fundamentally unpredictable: Whatever clues existed weren’t ones that an opposing player could discern. By the time the ball had been hit, on the other hand, even a novice could make a plausible guess at its trajectory. What separated the pros from everyone else was the ability to pull directional information out of the early stages of a swing and therefore to predict a split second earlier where to head. This fraction of time is game- changing. A serve going 120 miles per hour takes approximately a third of a second to travel the 60 feet from baseline to service line. This means that an expert, who doesn’t have to wait until contact, has twice as long to move, plant his feet, and swing.
This discovery fit with something Farrow and other tennis researchers had already suspected: Reflex speed is not the key factor in returning a serve. “People have tested casual players and experts, and their reaction times are essentially the same,” Farrow says. The fact that Roger Federer can drill back a 140-mile-per-hour serve is partly a matter of muscle control. But it’s also about processing subtle visual cues to predict where the ball will go and get to the right spot.

Read on at Wired…

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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