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Subjects rated the strength of the motion aftereffect (MAE) produced by the upward motion of a horizontal grating in two experiments. Inspection periods ranged from 30 to 900 sec in Experiment 1 and from 20 to 120 sec in Experiment 2. A minimum of 22 h elapsed between trials. The decay time constant increased as the square root of the inspection duration for values between 1 min and 15 min of inspection. The ratings suggested that the MAEs consisted of three phases: an initial maximum-strength phase, a decay phase, and a tail. The duration of all three phases increased and the decay rate decreased with increasing inspection duration over the entire range. The results indicate that duration, time constant, and decay rate are not fixed properties of the motion-processing channels in the visual system.

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This primer provides an overview of the principles of space perception in a handbook format that will appeal to researchers as well as students. A renewed interest in the study of vision has attracted scholars from such diverse fields as neuroscience, computer science, mathematics, physics, and philosophy. At the same time, the development of imaging devices and popularization of stereoscopic effects has increased student interest in vision. Both groups require more depth than is available in undergraduate texts and more breadth than is usually available in handbooks. This primer provides an overview of the principles of space perception in a handbook format that will appeal to researchers as well as students. Topics covered include geometrical and distal-proximal relationships, spatial localization, stereopsis, cyclopean perception, stimulus inadequacy, pictorial cues, perceived size and shape, Gibsonian psychophysics, lateral motion, motion in depth, perceived object motion, and motion detection. Bradford Books imprint