Effects of luminance and contrast on direction of ambiguous apparent motion

Anstis, Stuart M. and Mather, George (1985) Effects of luminance and contrast on direction of ambiguous apparent motion. Perception, 14 (2). pp. 167-179. ISSN 0301-0066

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Item Type:Article
Item Status:Live Archive


A study is reported of the role of luminance and contrast in resolving ambiguous apparent motion (AM). Different results were obtained for the short-range (SR) and the long-range (LR) motion-detecting processes. For short-range jumps (7.5 min arc), the direction of ambiguous AM depended on brightness polarity, with AM only from white to white and from black to black. But for larger jumps, or when an interstimulus interval (ISI) was introduced, AM was less dependent on polarity, with white often jumping to black and black jumping to white. Two potential AMs were pitted against each other, one carried by a light stimulus and the other by a dark stimulus. The stimulus whose luminance differed most from the uniform surround captured the AM. Visual response to luminance was linear, not logarithmic. When the stimulus was modified to give continuous AM in one direction it was followed by a negative aftereffect of motion only when the spatial displacement was 1 min arc. A larger displacement (10 min arc) gave good AM but no motion aftereffect. Thus only short-range motion adapts motion-sensitive channels.

Keywords:adaptation, article, color vision, human, illumination, light, movement perception, physiology, vision, visual illusion, Adaptation, Physiological, Color Perception, Figural Aftereffect, Lighting, Motion Perception, Optical Illusions, Support, Non-U.S. Gov't
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:16147
Deposited On:03 Dec 2014 16:36

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