Abstract

The threshold size of an object as a function of its speed has been determined, with the eyes fixed using seven different speeds from 55 to 600 cm/sec. The relationship is found to be linear and is given by the equation <i>O</i>=<i>a</i>+<i>bV</i>, where <i>O</i> is the threshold size in millimeters, <i>V</i> is the speed in centimeters per second, and <i>a</i> and <i>b</i> are constants characteristic of the individual. It is suggested that the spatio-temporal pattern at the psychovisual cortex is in some way responsible for the observed function.

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