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Motion capture of luminance stimuli by equiluminous color gratings and by attentive tracking.

Conducted 2 experiments to separate the effects of capture by color and attention suggested in preliminary observations (P. Cavanagh; see record 1993-12146-001). Data were obtained from 2 naive Ss and one of the authors. All Ss had normal color vision and corrected-to-normal acuity. In Exp 1, Ss viewed a series of individual trials in which bright dots were presented alone or superimposed on a color grating rotating in opposite directions. Capture observed at equiluminance was facilitated by the presence of color in gratings over a range of luminance contrasts. In the 2nd experiment, 2 of the 3 Ss participated. When a counterphase grating was tracked in either direction with attention, the superimposed dots were captured in that direction. These results suggest that motion capture is supported not only by luminance-based motion, but also by color- and attention-based motion. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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