Presentation | 2004/5/21 Neural correlates of red-green simultaneous color contrast in the human visual cortex Aki KONDO, Asuka NAKAGOSHI, Hiroki YAMAMOTO, Chuzo TANAKA, Masahiro UMEDA, Yoshimichi EJIMA, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | Color appearance depends on chromatic context. We used fMRI to explore human visual areas underlying the color contrast effect. Subjects were scanned while viewing equiluminant red-green flicker stimuli consisted of test disks and a surround. Chromatic context was changed by the relative phase of the test and surround flicker, by presenting them in opposite-phase (OP) or in-phase (IP). The apparent chromatic change of the test was larger for OP than for IP. We observed fMRI responses correlated with the perceptual color change in most of lower and higher visual areas. When the gaps (0.5° or 1°) were introduced between the test and surround, the responses became progressively weaker in most areas as the gap became thicker. But the responses still remained in some higher areas, especially in a portion of ventral or dorsal occipital region. This indicates that the spatial extent of color contrast processing increases with the hierarchy level of the visual cortical pathway. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | vision / Color Induction / fMRI / visual areas |
Paper # | HIP2004-3 |
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Committee | HIP |
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Conference Date | 2004/5/21(1days) |
Place (in Japanese) | (See Japanese page) |
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Registration To | Human Information Processing (HIP) |
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Language | JPN |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | Neural correlates of red-green simultaneous color contrast in the human visual cortex |
Sub Title (in English) | |
Keyword(1) | vision |
Keyword(2) | Color Induction |
Keyword(3) | fMRI |
Keyword(4) | visual areas |
1st Author's Name | Aki KONDO |
1st Author's Affiliation | Graduate School of Human and Environmental Studies, Kyoto University() |
2nd Author's Name | Asuka NAKAGOSHI |
2nd Author's Affiliation | Faculty of Medical Informatics, Meiji University of Oriental Medicine |
3rd Author's Name | Hiroki YAMAMOTO |
3rd Author's Affiliation | Graduate School of Human and Environmental Studies, Kyoto University |
4th Author's Name | Chuzo TANAKA |
4th Author's Affiliation | Faculty of Neurosurgery, Meiji University of Oriental Medicine |
5th Author's Name | Masahiro UMEDA |
5th Author's Affiliation | Faculty of Neurosurgery, Meiji University of Oriental Medicine / |
6th Author's Name | Yoshimichi EJIMA |
6th Author's Affiliation | |
Date | 2004/5/21 |
Paper # | HIP2004-3 |
Volume (vol) | vol.104 |
Number (no) | 100 |
Page | pp.pp.- |
#Pages | 6 |
Date of Issue |