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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Acknowledgement We gratefully acknowledge useful conversations with Hiromichi, Sato. The present work was partly supported by Grant-in-Aid for Scientific Research on Priority Areas (C) Advanced Brain Science Project from the Japanese Ministry of Education, Science, Sports, and Culture.
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Okamoto, T., Watanabe, M., Aihara, K. et al. An explanation of contextual modulation by short-range isotropic connections and orientation map geometry in the primary visual cortex. Biol. Cybern. 91, 396–407 (2004). https://doi.org/10.1007/s00422-004-0528-9
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DOI: https://doi.org/10.1007/s00422-004-0528-9