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Influence of motion on chromatic detection

Published online by Cambridge University Press:  05 April 2005

PATRICK MONNIER  and
STEVEN K. SHEVELL
PATRICK MONNIER
Affiliation:
Departments of Psychology, and Ophthalmology and Visual Science, University of Chicago, Chicago
STEVEN K. SHEVELL
Affiliation:
Departments of Psychology, and Ophthalmology and Visual Science, University of Chicago, Chicago
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Abstract

Intense scrutiny has been focused on whether chromatic stimuli contribute to motion perception. The present study considers a related but different question: how does motion affect chromatic detection? Detection thresholds were measured for a disk that underwent a brief (13.3 ms) chromatic change in the L/(L+M) chromatic direction. The disk's presentation sequence and speed (0–16 deg/s) were manipulated. In the coherent presentation sequence, the disk moved smoothly along a circular path centered on the fixation point. In the random presentation sequence, the disk appeared randomly at positions along the circular path. In both types of sequences, the disk underwent a brief chromatic change midway through the temporal presentation sequence. Threshold was elevated in the coherent condition compared to the random condition, and threshold decreased with an increase in speed. The threshold elevation observed in the coherent presentation sequence can be accounted for by temporal integration. The decrease in threshold with an increase in speed can be accounted for by spatial integration. The results, therefore, can be explained by spatiotemporal integration, without invoking a neural mechanism specialized for motion.

Keywords

Motion perceptionChromatic detection
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 3 , May 2004 , pp. 327 - 330
Copyright
© 2004 Cambridge University Press

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