Saint-Amour D, Lepore F, Guillemot J P, 2000, "Plaid motion coherence can be achieved under dichoptic viewing" Perception 29 ECVP Abstract Supplement
Plaid motion coherence can be achieved under dichoptic viewing
D Saint-Amour, F Lepore, J P Guillemot
Plaid motion coherence was studied with orthogonal spatial-frequency components presented separately to each eye. In order to characterise the limits for binocular fusion, plaid motion coherence was assessed as a function of the difference in spatial frequency between the components. Plaid patterns composed of two square-wave drifting gratings (same contrast, velocity, and phase) were presented dichoptically through LCD shutter glasses. Interocular spatial-frequency differences were introduced by keeping the spatial frequency of one component constant at 5 cycles deg-1, and varying the spatial frequency of the other component in steps of 1/4 octave. The component gratings were oriented +45° and -45° from the horizontal axis so that, when binocular fusion of the two components was achieved, observers perceived horizontal coherent motion.
Results showed that, when both components were of identical spatial frequency, the subjects perceived coherent plaid motion. However, the binocular fusion broke down rapidly as the difference in spatial frequency between the components exceeded 1/4 octave. Overall, these findings suggest that plaid motion coherence can occur from combined inputs from each eye, but that this binocular fusion can tolerate only narrow spatial-frequency differences.[Supported by FCAR and NSERC.]
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