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The role of inferior temporal cortex in shape perception and object recognition Taijiro Doi 1 , Ichiro Fujita 2 1Laboratory for Cognitive Neuroscience, Graduate School of Engineering Science, Osaka University 2Laboratory for Cognitive Neuroscience, Graduate School of Biophysical Sciences, Osaka University Keyword: 下部側頭葉皮質 , IT , 形選択性 , 記憶 , 図地分化 pp.176-185
Published Date 2004/4/10
DOI https://doi.org/10.11477/mf.1431100191
  • Abstract
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 Inferior Temporal cortex(IT)is known for its importance in processing information of shape. Monkeys with lesions in IT cortex show severe deficits in shape discrimination tasks, leaving other visual abilities almost normal. Most neurons located in IT show selectivity for stimulus shape. Responses of some IT neurons show invariance to large changes in the stimulus position, size, and contour cues such as luminance, motion, texture, and binocular disparity. These neurons are thought to provide the neural basis of position-, size-, and cue-invariant object recognition. Recent studies on IT neurons have revealed new aspects of their intricate response characteristics. Activity of IT neurons depends not only on visual stimuli projected onto the retina, but also on the monkey's attentional state. Single IT neurons can signal different information at different points of time during their visual responses;early responses signal the stimulus category, and later ones transmit more detailed information related to the stimulus identity. When binocularly rivalrous stimuli are presented, activities of IT neurons parallel with the monkeys'subjective perception inferred from their behavioral responses, indicating a close link between neuronal activity in IT and subjective perception. Shape-selective IT neurons are also involved in recognition of an object. Intra-and/or inter-cortical networks in IT can change with learning of a pairing of two arbitrary items to form an association memory. A gradually rising activity of some IT neurons during the memory phase of a memory task may correspond to the retrieval processes of such memory. Further, IT neurons can discriminate the figure and the ground, even when the stimulus contour itself does not provide information sufficient for determining which side of the contour is the figure. IT neurons thus process and represent shape information in a manner useful for shape perception, change their stimulus selectivity dynamically with time, integrate information of many visual cues such as luminance, color, motion, binocular disparity, and play a role in memory retrieval. Through these processing, IT contributes to perception and recognition of objects.

(Received:November 26, 2003)


Copyright © 2004, Igaku-Shoin Ltd. All rights reserved.

基本情報

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

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