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The Journal of Neurophysiology Vol. 87 No. 3 March 2002, pp. 1488-1498
Copyright ©2002 by the American Physiological Society
1Department of Neurology, University of Tokyo School of Medicine, Tokyo 113-8655; 2Department of Physiology, Juntendo University School of Medicine, Tokyo 113-0033; and 3Brain Science Research Center, Tamagawa University Research Institute, Tokyo 194-8610, Japan
Kobayashi, Shunsuke,
Johan Lauwereyns,
Masashi Koizumi,
Masamichi Sakagami, and
Okihide Hikosaka.
Influence of Reward Expectation on Visuospatial Processing in
Macaque Lateral Prefrontal Cortex. J. Neurophysiol. 87: 1488-1498, 2002. The lateral prefrontal cortex (LPFC)
has been implicated in visuospatial processing, especially when it is
required to hold spatial information during a delay period. It has also
been reported that the LPFC receives information about expected reward
outcome. However, the interaction between visuospatial processing and
reward processing is still unclear because the two types of processing could not be dissociated in conventional delayed response tasks. To
examine this, we used a memory-guided saccade task with an asymmetric
reward schedule and recorded 228 LPFC neurons. The position of the
target cue indicated the spatial location for the following saccade and
the color of the target cue indicated the reward outcome for a correct
saccade. Activity of LPFC was classified into three main types: S-type
activity carried only spatial signals, R-type activity carried only
reward signals, and SR-type activity carried both. Therefore only
SR-type cells were potentially involved in both visuospatial processing
and reward processing. SR-type activity was enhanced (SR+) or depressed (SR
) by the reward expectation. The spatial discriminability as
expressed by the transmitted information was improved by reward expectation in SR+ type. In contrast, when reward information was coded
by an increase of activity in the reward-absent condition (SR
type),
it did not improve the spatial representation. This activity appeared
to be involved in gaze fixation. These results extend previous findings
suggesting that the LPFC exerts dual influences based on predicted
reward outcome: improvement of memory-guided saccades (when reward is
expected) and suppression of inappropriate behavior (when reward is not expected).
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