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Purely chromatic perception of motion in depth: Two eyes as sensitive as one.

Measured motion hyperacuity (phase) threshold for lateral and stereoscopic oscillatory motion in luminance and equiluminant red/green gratings of 2 cycles per degree in 2 observers. Thresholds for lateral chromatic motion did not exhibit the inhibitory fall-off at low temporal frequencies that was found for luminance motion. Phase thresholds for purely chromatic motion were substantially higher than those for luminance gratings, in proportion to the ratio of cone signal modulation. Stereomovement thresholds in luminance gratings showed the stereomovement suppression effect relative to monocular motion sensitivity previously reported for line stimuli but purely chromatic gratings did not. Results imply that chromatic and luminance motion are processed by different neural pathways and that the chrominance pathway is capable of supporting a strong percept of stereoscopic motion from purely chromatic gratings. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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