A ring model for spatiotemporal properties of simple cells in the visual cortex |
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Authors: | Takashi Hamada Masaki Yamashima Kazunori Kato |
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Institution: | (1) Electrotechnical Laboratory LERC, 3-11-46, Nakoji, Amagasaki, Hyogo 661, Japan, JP;(2) Fujitsu Ltd., Tokyo, Japan, JP;(3) Izumo Technical High School, Shimane 420, Japan, JP |
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Abstract: | A neural model is proposed for the spatiotemporal properties of simple cells in the visual cortex. In the model, several
cortical cells are arranged on a ring, with mutual excitatory or inhibitory connections. The cells also receive excitatory
inputs either from lagged and nonlagged cells of the lateral geniculate nucleus in one setting or from nonlagged cells in
the other. Computer simulation shows that the cortical cells have spatiotemporally inseparable receptive fields in the former
setting and separable fields in the latter; spatial profiles at a given time in the spatiotemporal fields are described with
a Gabor function whose phase parameter varies regularly from 0 to 2π with rotation along the ring; the inseparable cells have
directional selectivity as observed physiologically.
Received: 13 November 1995 / Accepted in revised form: 1 July 1997 |
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