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Journal of Neuroscience, Vol 2, 361-375, Copyright © 1982 by Society for Neuroscience
Neuronal firing in the inferotemporal cortex of the monkey in a visual memory task
JM Fuster and JP Jervey
The objective of this study was to elucidate the functional role of neurons
in the inferotemporal cortex of the primate. Single unit activity was
recorded with microelectrodes in monkeys performing a visual delayed
matching-to-sample task. On each trial, the animal was exposed briefly to a
color - the sample - and, after a period of delay, had to select the same
color among two or four colors simultaneously presented. Thus, correct
performance of the task required perception, retention, and recognition of
the sample color for every trial. A large number of inferotemporal units
were seen to react to the stimuli with changes of firing frequency. Many
units showed color-dependent reactions, suggesting their involvement in
perception and discrimination of colors. A substantial contingent of cells
showed increased, sustained, and in some cases, color-dependent discharge
during the delay which was not necessarily preceded or succeeded by firing
changes in sample or match periods. It is proposed that those cells were
engaged in temporary retention of the sample stimulus. Since most of the
inferotemporal units examined showed firing changes in more than one period
of a trial, they appeared to be involved in more than one of the operations
required by the task. Thus, the data do not support a clear-cut topographic
separation of visual functions within the inferotmeporal cortex. However,
neurons that appear to participate in visual memory, either exclusively or
in addition to other functions, are concentrated in the cortex of the lower
banks of the superior temporal sulcus.
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Memory
