Tuesday, June 3, 2008
Frog Went A Courtin' And He Did Ride...
"Animals who move or are in a world that moves around them—as long as there are things moving somehow relative to you—will be selected to have perceptions that are true. We have about a tenth of a second delay between the time light hits the retina and the time of resultant perception, which is considerable given that you move 10 centimeters in that amount of time even if you're only walking one meter per second. That means that if you didn't compensate for this neural delay, anything you perceive to be within 10 centimeters of passing...would have just passed you by the time you perceive it. You'd always be seeing the world as it was a tenth of a second earlier and seeing what the world looks like 10 centimeters behind where you in fact are--if you hadn't run into whatever it is you're looking for...."