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J Neurophysiol (August 30, 2006). doi:10.1152/jn.01224.2005
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Submitted on November 21, 2005
Accepted on August 27, 2006

Representation of the spatial relationship among object parts by neurons in macaque inferotemporal cortex

Yukako Yamane1, Kazushige Tsunoda2, Madoka Matsumoto2, Adam Phillips2, and Manabu Tanifuji2*

1 Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama, Japan; Division of Biological Sciences, Graduate School of Science, Hokkaido University, Kita-ku, Japan
2 Laboratory for Integrative Neural Systems, RIKEN Brain Science Institute, Wako, Saitama, Japan

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

We investigated object representation in area TE, the anterior part of monkey inferotemporal (IT) cortex, with a combination of optical and extracellular recordings in anesthetized monkeys. We found neurons that respond to visual stimuli composed of naturally distinguishable parts. These neurons were sensitive to a particular spatial arrangement of parts, but less sensitive to differences in local features within individual parts. Thus, these neurons were activated when arbitrary local features were arranged in a particular spatial configuration, suggesting that they may be responsible for representing the spatial configuration of object images. Previously, it has been reported that many neurons in area TE respond to visual features less complex than natural objects, but it has remained unclear whether these features are related to local features of object images or to more global features. These results indicate that TE neurons represent not only local features but also global features such as the spatial relationship among object parts.




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