Function of P and M Pathways in Primates.
Abstract
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 broadband pathway) appeared crucial for the visibility of low spatial frequencies (broad contours), as well as sensitivity to rapidly drifting visual stimuli.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 13, 1992
- Accession Number
- ADA250055
Entities
People
- William Merigan
Organizations
- University of Rochester