Function of Panel M Pathways in Primates
Final technical rept. 1 Oct 1988-30 Sep 1991,
ROCHESTER UNIV NY
Pagination or Media Count:
Psychophysical threshold measures were used in combination with precisely located lesions of the sub-cortical visual pathway to examine segregation of function between P and M pathways. Scleral search coils monitored fixation locus in the tested monkeys, to insure that test stimuli were presented in visual field regions corresponding to the lesion location. Results of these studies indicated that the P pathway or color-opponent pathway is the major contributor to visual acuity, color vision, and luminance contrast sensitivity. On the other hand, the M pathway or broad contours, as well as sensitivity to rapidly drifting visual stimuli. A special role for the M pathway in the processing of visual motion was ruled out by determining its contribution to directional and velocity sensitivity.
- Anatomy and Physiology