Contrast sensitivity and retinal ganglion cell responses in the primate
Psychol. neurosci. (Impr.)
;
4(1): 11-18, Jan.-June 2011. ilus, graf
Article
in English
| LILACS
| ID: lil-604530
ABSTRACT
Human contrast sensitivity is considered in relation to the responses delivered by retinal ganglion cells of the primate to luminance and chromatic contrast. At different temporal frequencies, response amplitude relative to response variability determines the limit to sensitivity of a single ganglion cell. This can be related to specific models of central detection mechanisms. Both for luminance and chromatic contrast, psychophysical sensitivity to temporal modulation can be achieved by summation of activity of just a few cells that provide input to a detection mechanism. This analysis is then extended to a spatial context. Several sets of data indicate that, in spatial terms, detection mechanisms are of limited spatial extent, and that, at least in the case of luminance patterns, eye movements play a critical role in contrast detection.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Primates
/
Retinal Ganglion Cells
/
Contrast Sensitivity
/
Eye Movements
Type of study:
Diagnostic study
Limits:
Animals
Language:
English
Journal:
Psychol. neurosci. (Impr.)
Journal subject:
Neurology
/
Psychology
Year:
2011
Type:
Article
Affiliation country:
United States
Institution/Affiliation country:
State University of New York/US
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