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J Neurophysiol (November 15, 2006). doi:10.1152/jn.00167.2006
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Submitted on February 15, 2006
Accepted on November 6, 2006

Enhancement of object representations in primate perirhinal cortex during a visual working memory task

Sidney R. Lehky1* and Keiji Tanaka2

1 Cognitive Brain Mapping Laboratory, RIKEN Brain Science Institute, Wako, Saitama, Japan
2 Cognitive Brain Mapping Laboratory, RIKEN Brain Science Institute, Wako, Saitama, Japan; Graduate School of Science and Engineering, Saitama University, Saitama-shi, Saitama, Japan

* To whom correspondence should be addressed. E-mail: sidney{at}brain.riken.go.jp.

We compared single-cell activities in perirhinal cortex (PRh) as well as adjacent visual cortex (area TE) across two tasks. One task required the monkey to identify any stimulus repetition within a sequence of object stimuli. In the other task, the same stimuli were presented but the monkey didn't have to remember them. PRh responses during the object-memory task were elevated relative to those during the second task. In TE, on the other hand, there were no significant task-related differences in responses. We did not observe task related differences related to repetition effects in either brain area. The onset of the enhanced signal in PRh during the object-memory task occurred with a latency of 80 msec following the onset of the stimulus response, suggesting that it was the result of top-down feedback.




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