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)
赤崎 孝文 大阪大学, 健康体育部, 助手 (30335393)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥1,900,000 (Direct Cost: ¥1,900,000)
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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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Report
(3 results)
Research Products
(8 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
Related Report
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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
Related Report
-
[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 (印刷中)
Related Report
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[Journal Article] Relationship between excitation and inhibition underlying size tuning and contextual response modulation in the cat primary visual cortex.2004
Author(s)
Ozeki, H., Sadakane, O., Akasaki, T., Naito, T., Shimegi, S., Sato, H.
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Journal Title
Journal of Neuroscience 24
Pages: 1428-1438
Related Report
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