A variant of the anomalous motion illusion based upon contrast and visual latency |
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Authors: | Kitaoka Akiyoshi Ashida Hiroshi |
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Institution: | Department of Psychology, Ritsumeikan University, 56-1 Tojiin Kitamachi, Kita-ku, Kyoto 603-8577, Japan. akitaoka@lt.ritsumei.ac.jp |
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Abstract: | We examined a variant of the anomalous motion illusion. In a series of experiments, we ascertained luminance contrast to be the critical factor. Low-contrast random dots showed longer latency than high-contrast ones, irrespective of whether they were dark or light (experiments 1 -3). We conjecture that this illusion may share the same mechanism with the Hess effect, which is characterised by visual delay of a low-contrast, dark stimulus in a moving situation. Since the Hess effect is known as the monocular version of the Pulfrich effect, we examined whether illusory motion in depth could be observed if a high-contrast pattern was projected to one eye and the same pattern of low-contrast was presented to the other eye, and they were binocularly fused and swayed horizontally. Observers then reported illusory motion in depth when the low-contrast pattern was dark, but they did not when it was bright (experiment 4). Possible explanations of this inconsistency are discussed. |
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