Journal
JOURNAL OF VISION
Volume 5, Issue 7, Pages 603-621Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/5.7.1
Keywords
color; motion; MT; macaque; vision; cones
Categories
Funding
- NATIONAL EYE INSTITUTE [R37EY005603, R01EY005603, R01EY003164] Funding Source: NIH RePORTER
- NEI NIH HHS [EY-05603, EY-03164] Funding Source: Medline
Ask authors/readers for more resources
Many experimental measurements support the hypothesis that the middle temporal visual area (MT) of the rhesus monkey has a central role in processing visual motion. Most of these studies were performed using luminance stimuli, leaving open the question of how color information is used during motion processing. We investigated the specific question of how Scone signals, an important source of color information, interact with L, M-cone signals, the dominant source of luminance information. In MT, S-cone-initiated signals combine synergistically with L, M-cone ( luminance) signals over most of the stimulus range, regardless of whether the stimuli are added or subtracted. A quantitative analysis of the responses to the combination of S- and L, M-cone signals shows that for a significant minority of cells, these S- cone signals are carried to MT by a color-opponent (blue-yellow'') pathway, such that in certain limited contrast ranges, a small amount of S- and L, M-cone cancellation is observed. Both S- and L, M-cone responses are direction-selective, suggesting that MT processes a wide range of motion signals, including those carried by luminance and color. To investigate this possibility further, we measured MT responses while monkeys discriminated the direction of motion of luminance and S- cone-initiated gratings. The sensitivity of single MT neurons and the correlation between trial-to-trial variations in single neuron firing and perception are similar for S- and L, M-cone stimuli, further supporting a role for MT in processing chromatic motion.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available