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J Neurophysiol 79: 1135-1144, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 79 No. 3 March 1998, pp. 1135-1144
Copyright ©1998 The American Physiological Society

Coding Strategies in Monkey V1 and Inferior Temporal Cortices

Ethan D. Gershon, Matthew C. Wiener, Peter E. Latham, and Barry J. Richmond

Laboratory of Neuropsychology, National Institute of Mental Health, and Laboratory of Developmental Neurobiology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892

Gershon, Ethan D., Matthew C. Wiener, Peter E. Latham, and Barry J. Richmond. Coding strategies in monkey V1 and inferior temporal cortices. J. Neurophysiol. 79: 1135-1144, 1998. 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 inferior temporal (IT) cortices of awake monkeys. In both areas, the distribution of spike counts for each stimulus was well described by a Gaussian distribution, 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) versus 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 IT neurons, which use less variable signals over a smaller dynamic range. The two coding strategies are approximately as effective in transmitting information.




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