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Human psychophysical studies have demonstrated that, for stimuli near the threshold of visibility, detection of motion in one direction is unaffected by the superimposition of motion in the opposite direction. To investigate the neural basis for this perceptual phenomenon, we recorded from directionally selective neurons in macaque visual area MT (middle temporal visual area). Contrast thresholds obtained for single gratings moving in a neuron's preferred direction were compared with those obtained for motion presented simultaneously in the neuron's preferred and antipreferred directions. A simple model based on probability summation between neurons tuned to opposite directions could sufficiently account for contrast thresholds revealed psychophysically, suggesting that area MT is likely to provide the neural basis for contrast detection of stimuli modulated in time.
Author(s): Thiele A; Dobkins KR; Albright TD
Publication type: Article
Publication status: Published
Journal: Neuron
Year: 2000
Volume: 26
Issue: 3
Pages: 715-724
ISSN (print): 0896-6273
ISSN (electronic): 1097-4199
Publisher: Cell Press
URL: http://dx.doi.org/10.1016/S0896-6273(00)81207-6
DOI: 10.1016/S0896-6273(00)81207-6
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