tricks of the eye

Avert Your Eyes
Distraction is key. “That’s the game: getting people to focus attention in the wrong place, though you’re doing it in front of their eyes,” says Dan Simons, a visual cognition and perception expert at the University of Illinois at Urbana-Champaign. Attention is like a spotlight: We notice only what it’s focused on.

Follow the Leader
Because people instinctively look where other people are looking, the magician gazes where he wants you to look, and your eyes follow.

Too Much Information
A steady stream of verbal patter also provides camouflage. People have limited attention: Fill it with fast talk, and they’re less likely to notice other details.

But I Saw It!
People have a tendency to see what they expect to see. “The magician pretends to throw a ball up in the air. People perceive the ball moving up, even though it never left his hand,” explains Gustav Kuhn, a magician and research psychologist at the University of Durham in England. The harder you look, the less likely you are to spot the sleight.
http://www.psychologytoday.com/rss/pto-20060925-000002.html

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