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Perception of motion in equiluminous kinematograms.

Hypothesized that the interference of the dark interstimulus interval with the motion perception in kinematograms would be even greater for the relatively weak motion stimulus provided by an equiluminous presentation. Two of the authors and 2 naive observers served as Ss. Two fields of random dots that were identical except for a slight shift in a central square region were presented in rapid alternation, producing a vivid impression of a square moving back and forth above the background. When the kinematogram was presented in equiluminous red/green, the motion of the central region was still observed, although over a narrower range of alternation rates, interstimulus intervals, and displacements than for black/white presentation. The perception of motion for equiluminous stimuli indicates that color and motion can be analyzed conjointly by the visual system. However, as reported by V. S. Ramachandran and R. L. Gregory (see record 1980-11163-001), the segregation of the oscillating central square from the background is lost at equiluminance. This segregation process appears to be color-blind. (32 ref) (PsycINFO Database Record (c) 2007 APA, all rights reserved)