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Baby Lab

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Sensitivity to colour- and to orientation-carried motion respectively improves and deteriorates under equiluminant background conditions

Describes 2 distinct effects produced by manipulation of the background illumination on the directional sensitivity to color- and orientation-carried motion. The 2 motion percepts were produced with 2 of a class of stimuli extensively used in apparent-motion studies and designed to produce motion perception by virtue of spatiotemporal matching of (1) color with orientation systematically mismatched (C x O) and (2) orientation with color systematically mismatched (O x C). Three experiments were conducted with the 1st 3 authors serving as Ss. An increase in background illumination from dark to the equiluminance point entailed a significant increase and decrease of directional performances with C x O and O x C stimuli, respectively. It is proposed that these antisymmetrical background effects have distinct neurophysiological origins. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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