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 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.
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Keyword(in English) vision / Color Induction / fMRI / visual areas
Paper # HIP2004-3
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Committee HIP
Conference Date 2004/5/21(1days)
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Registration To Human Information Processing (HIP)
Language JPN
Title (in Japanese) (See Japanese page)
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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