Author:
WEISS STEFAN,KREMERS JAN,MAURER JOHANNES
Abstract
Parvocellular (P-) and magnocellular (M-) cells
in the marmoset LGN can receive prominent rod input up
to relatively high illuminance levels (Kremers et al.,
1997b). In the present paper, we quantify rod
and cone input strengths under different retinal illuminance
levels. The stimulus was based on the so-called “silent
substitution” method. The activities of P- and M-cells
of dichromatic animals were recorded extracellularly. We
were able to adequately describe the response amplitudes
and phases by a vector summation of rod and cone signals.
At low retinal illuminance levels, the cells' responses
were determined by rod and cone inputs. With increasing
illuminances the strength of the cone input increased relative
to the rod strength. But, we often found significant rod
inputs up to illuminances equivalent to 700 td in the human
eye or more. Rod input strength was more pronounced in
cells with receptive fields at large retinal eccentricities.
The phase differences between rod and cone inputs suggest
that the rod signals lag about 45 ms behind the cone signals.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
Cited by
25 articles.
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