VISUAL INTERACTIONS IN THE PATH OF APPARENT MOTION

When two stationary visual objects appear in alternating sequence, the y evoke the perception of a single object moving back and forth betwee n them. This is known as stroboscopic or apparent motion and forms the basis of perceived continuity in, for example, motion pictures. When the spatiotemporal separation between the inducing objects is optimal, the subjective appearance of apparent motion is nearly indistinguisha ble from that of real motion. Here we report that the detection and id entification of a simple visual form in the path of apparent motion is impaired by the illusory perception of an object moving through the e mpty space between the locations at which the inducing objects are pre sented. This observation may be a manifestation of perceptual completi on of 'filling in' during apparent motion perception. We propose that feedback from higher to lower visual cortical areas activates an expli cit neural representation of a moving object, which can then disrupt t he representation of visual stimuli in the path of the movement.