Biology – Quantitative Biology – Neurons and Cognition
Scientific paper
1998-04-09
J. Neurophsysiol. 79: 1135-1144, 1998
Biology
Quantitative Biology
Neurons and Cognition
25 pages, 8 figures. Originally submitted to the neuro-sys archive which was never publicly announced (was 9804001)
Scientific paper
We would like to know whether the statistics of neuronal responses vary across cortical areas. We examined stimulus-elicited spike count response distributions in V1 and IT cortices of awake monkeys. In both areas the distribution of spike counts for each stimulus was well-described by a Gaussian, with the log of the variance in the spike count linearly related to the log of the mean spike count. Two significant differences in response characteristics were found: both the range of spike counts and the slope of the log(variance) vs. log(mean) regression were larger in V1 than in IT. However, neurons in the two areas transmitted approximately the same amount of information about the stimuli, and had about the same channel capacity (the maximum possible transmitted information given noise in the responses). These results suggest that neurons in V1 use more variable signals over a larger dynamic range than neurons in IT, which use less variable signals over a smaller dynamic range. The two coding strategies are approximately as effective in transmitting information.
Gershon Ethan D.
Latham Peter E.
Richmond Barry J.
Wiener Matthew C.
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