视觉的影响.pptVIP

视觉错觉与爱情错觉 * Humans can see into the future, says a cognitive scientist. Its nothing like the alleged predictive powers of Nostradamus（占卜者）, but we do get a glimpse of events one-tenth of a second before they occur.??? And the mechanism behind that can also explain why we are tricked by optical illusions.??? Researcher Mark Changizi of Rensselaer Polytechnic Institute in New York says it starts with a neural lag（神经滞后） that most everyone experiences while awake. When light hits your retina（视网膜）, about one-tenth of a second goes by before the brain translates the signal into a visual perception of the world.??? Scientists already knew about the lag, yet they have debated over exactly how we compensate, with one school of thought proposing our motor system somehow modifies our movements to offset the delay. Changizi now says its our visual system that has evolved to compensate for neural delays, generating images of what will occur one-tenth of a second into the future. That foresight keeps our view of the world in the present. It gives you enough heads up to catch a fly ball (instead of getting socked in the face) and maneuver smoothly through a crowd. His research on this topic is detailed in the May/June issue of the journal Cognitive Science. Heres how the foresight theory could explain the most common visual illusions - geometric illusions that involve shapes: Something called the Hering illusion, for instance, looks like bike spokes around a central point, with vertical lines on either side of this central, so-called vanishing point（没影点）. The illusion tricks us into thinking we are moving forward, and thus, switches on our future-seeing abilities. Since we arent actually moving and the figure is static, we misperceive the straight lines as curved ones. Then tell me what the diferents are.I give you half a minute. Can you find any different from this picture? 2007年度的最佳视觉错觉大赛已经结束了，这次大会的第一名The Leaning Tower lllusion可以说实在是经典：????? 如图所示为意大利比萨斜塔的两张照片，我们可以明显感觉到右