Discrimination of moving gratings at and above detection threshold

Two experiments examined the discriminability of moving gratings. Experiment 1 measured the difference between detection and discrimination thresholds for gratings of equal spatial frequency drifting in the same direction at different rates. It was found that, as Watson and Robson [ Vision Res. 21,...

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Bibliographic Details
Published in:	Vision research (Oxford) 1983, Vol.23 (12), p.1533-1538
Main Author:	Thompson, Peter
Format:	Article
Language:	eng
Subjects:	Biological and medical sciences Discrimination (Psychology) - physiology Form Perception - physiology Fundamental and applied biological sciences. Psychology Humans Male Motion Perception - physiology Pattern Recognition, Visual - physiology Perception Psychology. Psychoanalysis. Psychiatry Psychology. Psychophysiology Sensory Thresholds - physiology Space life sciences Time Factors Vision
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Summary:	Two experiments examined the discriminability of moving gratings. Experiment 1 measured the difference between detection and discrimination thresholds for gratings of equal spatial frequency drifting in the same direction at different rates. It was found that, as Watson and Robson [ Vision Res. 21, 1115–1122 (1981)] had found with counterphase modulated gratings, only very coarse discriminations could be made. The results suggest that just two labelled channels can account for the velocity discrimination of gratings at detection threshold. The second experiment investigated the discriminability of suprathreshold moving gratings. These results also support the idea that rate of movement is mediated by two broadly tuned channels.
ISSN:	0042-6989 1878-5646