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Neural mechanisms of visual recognition: the primate temporal cortex and hippocampus. Yasushi MIYASHITA 1 1Department of Physiology, Faculy of Medicine, University of Tokyo pp.553-565
Published Date 1988/8/10
DOI https://doi.org/10.11477/mf.1431906208
  • Abstract
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 It has been proposed that visual memory traces are located in the temporal lobes of the cerebral cortex, as electric stimulation of this area in humans results in recall of imagery. Lesions in this area also affect recognition of an object after a delay in both humans and monkeys, indicating a role in visual memory. However, single-unit recordings from the temporal cortex have shown that neuronal responses selective to specific complex objects, including hands and faces, cease soon after the offset of stimulus presentation. These results left it open whether any of theseneurons could serve the memory of complex objects.

 In this article, we first summarize behavioral data which suggest differential roles of the temporal neocortex and the hippocampus in visual memory : the storehouse of memory engram and the memory consolidation machinery. Then, we report electrophysiological evidence ; a group of shape-selective neurons in an anterior ventral part of the temporal cortex of monkeys exhibited sustained activity during the delay period of a visual working memory task. The activity was highly selective for the pictorial information to be memorized and was independent of the physical attributes such as size, orientation, color or position of the object. These observations indicate that the delay activity represents the working memory of categorized percept of a picture. Finally, we describe some preliminary data on the hippocampal and parahippocampal neuronal activity during the learning of visual stimulus-motor response association.


Copyright © 1988, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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