SUPPRESSION AND FUSION IN STEREOPSIS.
Final rept., 1 Aug 64-31 Jul 67,
SPERRY RAND RESEARCH CENTER SUDBURY MASS
Pagination or Media Count:
The behavioral studies reports have led to the conclusion that sensory fusion of disparate binocular stimuli cannot be distinguished from suppression. Singleness of vision under these circumstances may be attributed to the suppression of parts of each eyes input. The stimulus dimension most relevant to stereopsis appears to be disparity in relative brightness. Moreover, stereopsis can occur when the contours imaged on the two retinas are rivalrous. Hence rivalry is not incompatible with stereopsis. Brightness disparities may be superposed on any pattern of contours, even those which are classically deemed fusable, and stereopsis may be predicted from the distribution of brightness. Although contour is not necessary to the occurrence of stereopsis, recent evidence suggests that it may be sufficient. It would appear that two parallel systems can operate to mediate binocular depth perception a system which includes a spatial brightness-averaging mechanism and a system which includes a contour processing mechanism. Both systems involve a scheme which entails correlation of arrays along either a brightness or a contour dimension. Hence some form of monocular pattern recognition may occur during stereopsis. An effort was made to verify reports of others that rivalry is accompanied by changes in the evoked response. This was not verified in a number of experiments. Nonlinear interaction between inputs to corresponding places to the two eyes will occur regardless of the nature of the stimuli. Author
- Anatomy and Physiology