Presentation 2002/3/11
Contextual modulation of population coding and oscillatory input
Narihisa MATSUMOT, Masato OKADA, Kenji DOYA, Mitsuo KAWATO,
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Abstract(in English) Perception of physical quantities, i.e., form, brightness and color, and the responses of V1 neurons can be influenced by a context surrounding the target. This is called "contextual modulation". We discuss both the diffusion process of representation of physical quantities and the control mechanism of this diffusion by using two hypercolumn (HC) model underlying population coding. Two line segments with different angles are injected to the two HCs, which are connected each other by excitatory connections. Then the difference of the angles represented on the HCs is smaller than that of the angles of the lines by the stability of a local excitation. Next, additional oscillatory inputs inject to each HC to gate the diffusion. We found the angle difference represented on the HCs in the in-phase case is smaller than in the anti-phase case. This means that the phase difference of two pieces of oscillatory input serves as the flag which controls the interaction between the HCs.
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Keyword(in English) population coding / hypercolumn / oscillatory input / contextual modulation
Paper # NC2001-138
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Committee NC
Conference Date 2002/3/11(1days)
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Registration To Neurocomputing (NC)
Language JPN
Title (in Japanese) (See Japanese page)
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Title (in English) Contextual modulation of population coding and oscillatory input
Sub Title (in English)
Keyword(1) population coding
Keyword(2) hypercolumn
Keyword(3) oscillatory input
Keyword(4) contextual modulation
1st Author's Name Narihisa MATSUMOT
1st Author's Affiliation Graduate School of Science and Engineering, Saitama University:RIKEN Brain Science Institute()
2nd Author's Name Masato OKADA
2nd Author's Affiliation RIKEN Brain Science Institute
3rd Author's Name Kenji DOYA
3rd Author's Affiliation ATR Human Information Science Laboratories:CREST, Japan Science Techonology corporation
4th Author's Name Mitsuo KAWATO
4th Author's Affiliation ATR Human Information Science Laboratories
Date 2002/3/11
Paper # NC2001-138
Volume (vol) vol.101
Number (no) 735
Page pp.pp.-
#Pages 8
Date of Issue