Motion Rivalry Impairs Motion Repulsion

Yuzhi Chen, Nestor Matthews, and Ning Qian, Vision Research, 2001, 41:3639-3647.
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In their classic study on motion repulsion, Marshak and Sekular (1979) reported a repulsion of up to 10 deg when two different directions of motion were presented dichoptically. However, subjects in that study did not experience binocular rivalry, presumably because of the brief presentation time. In the present study, we measured repulsion during binocular rivalry by requiring subjects to dichoptically view the stimuli until one direction of motion appeared to exclusively dominate the other (Blake, Yu, Lokey and Norman, 1998). We found that motion repulsion was significantly reduced during exclusive dominance. Indeed, after controlling for reference repulsion--the misjudgment of a single direction of motion (Rauber and Treue, 1998)--we found no significant motion repulsion during exclusive dominance. These data suggest that motion repulsion may require the perception, rather than merely the physical presence, of multiple directions.

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