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Enhancement of Object Representations in Primate Perirhinal Cortex During a Visual Working-Memory Task

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

Submitted 16 February 2006; accepted in final form 6 November 2006

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 ms after the onset of the stimulus response, suggesting that it was the result of top-down feedback.