Motion Rivalry Impairs Motion Repulsion
Yuzhi Chen, Nestor Matthews, and Ning Qian, Vision Research,
2001, 41:3639-3647.
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Abstract
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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