2005 Fiscal Year Final Research Report Summary
Spatio-temporal interaction in the parallel pathways of visual system
| Project/Area Number |
16500263
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Neurophysiology and muscle physiology
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| Research Institution | Osaka University |
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Principal Investigator |
SATO Hiromichi Osaka University, Graduate School of Medicine, Professor, 医学系研究科, 教授 (50154092)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMEGI Satoshi Osaka University, Graduate School of Medicine, Associate Professor, 医学系研究科, 助教授 (20271033)
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| Project Period (FY) |
2004 – 2005
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| Keywords | visual information processing / parallel pathway / metacontrast / primary visual cortex / receptive field / stimulus characteristics / contextual modulation |
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| Research Abstract |
In the primary visual cortex (V1), a response to a stimulus in the classical receptive field (CRF) is suppressively modulated by a stimulus presented in the CRF surround (SRF). We examined the temporal dynamics of the response to CRF stimulation and the surround suppression in terms of spatial-frequency (SF) tuning of cat V1 neurons using stationary flashes of a circular sinusoidal grating patch (duration, 500ms) and an annulus (50ms) as CRF and SRF stimuli. In Experiment 1 (N=39), we stimulated CRF with grating patch of optimal orientation and varying SFs. The preferred SF shifted from low to high along time course of response. In Experiment 2 (N=48), CRF was stimulated with grating of optimal orientation and SF, while SRF was stimulated with grating of optimal orientation and varying SF sandstimulus-onset-asynchrony (SOA). SF tuning of surround suppression changed along time course of response, and effective SF of surround suppression shifted from the SF lower than that of CRF stimulus (CRF-SF) to that near CRF-SF. By changing SOA, we examined surround suppression on different temporal phases of CRF response. SRF stimulus only with low SF (<0.2c/deg) suppressed the initial phase of CRF response. These results suggest that multiple mechanisms with different SF- and temporal characteristics are involved in the surround suppression.
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Research Products
(6 results)
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[Journal Article] Contrast-dependent, contextual response modulation in primary visual cortex and lateral geniculate nucleus of cat.2006
Author(s)
Sadakane, O., Ozeki, H., Naito, T., Akasaki, T., Kasamatsu, T., Sato, H.
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Journal Title
European Journal of Neuroscience 23
Pages: 1633-1642
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Contrast-dependent, contextual response modulation in primary visual cortex and lateral geniculate nucleus of cat.2006
Author(s)
Sadakane, O., Ozeki, H., Naito, T., Akasaki, T., Kasamatsu, T.Sato, H.
-
Journal Title
European Journal of Neuroscience 23
Pages: 1633-1642
Description
「研究成果報告書概要(欧文)」より
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