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  An explanation of contextual modulation by short-range isotropic connections and orientation map geometry in the primary visual cortex

Okamoto, T., Watanabe, M., Aihara, K., & Kondo, S. (2004). An explanation of contextual modulation by short-range isotropic connections and orientation map geometry in the primary visual cortex. Biological Cybernetics, 91(6), 396-407. doi:10.1007/s00422-004-0528-9.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D72B-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D72C-A
Genre: Journal Article

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Okamoto, T, Author
Watanabe, M1, Author              
Aihara, K, Author
Kondo, S, Author
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: Recent experimental studies on the primary visual cortex have revealed complicated nonclassical neuronal activities. Contextual modulation on orientation-contrast is one typical example of nonclassical neuronal behavior. This modulation by surrounding stimuli in a nonclassical receptive field is mainly thought to be mediated by short- and long-range horizontal connections within the primary visual cortex. Short-range connections are circularly symmetrical and relatively independent of orientation preferences, while long-range connections are patchy, asymmetrical, and orientation specific. Although this modulation can be explained by long-range specific connections qualitatively, recent studies suggest that long-range connections alone may be insufficient with respect to the balance between two types of connections. Here, in order to clarify the role of short-range connections in the process of contextual modulation, we propose a model of the primary visual cortex with isotropic short-range connections and a geometric orientation map. Computational simulations using the model have demonstrated that contextual modulation can be explained by short-range connections alone. This is due to the interaction between the spatial periodicity of orientation domains and the excitatory-inhibitory regions arising from the propagation of activities.

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 Dates: 2004-12
 Publication Status: Published in print
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Title: Biological Cybernetics
Source Genre: Journal
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Pages: - Volume / Issue: 91 (6) Sequence Number: - Start / End Page: 396 - 407 Identifier: -