Comparison between Cortical Activities of Dichromats and Trichromats in Responding to Categorical colors

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  • Nishita Hirotoshi
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Yoshizawa Tatsuya
    Human Information System Laboratory, Kanazawa Institute of Technology
  • Kojima Haruyuki
    Faculty of Human Sciences, Kanazawa University
  • Fukuda Kazuho
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Uchikawa Keiji
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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  • ２色覚者と３色覚者間でのカテゴリカル色応答時の皮質活動の比較

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Protans and deutans have low ability in color discrimination along the red-green direction. However, it has been reported that in the color-naming task, they can distinguish chromatic stimuli along that direction, which gives rise to the suggestion that dichromats may name colors using some non-chromatic cues. Nishita et al. (2013) showed in psychophysical experiments that dichromats performed trichromat-like color-naming by using surface luminance cues. In this study, we measured changes in the oxy-Hb concentration of the lateral occipital regions of the brain during the performance of color-naming tasks using near-infrared spectroscopy, in order to investigate which cortical level of the color-naming mechanism of dichromat luminance cues were involved. Results showed that cortical activity exhibited no significant difference among all stimulus conditions ; however, the color-naming results showed clear differences between dichromats and trichromats, with some differences among stimulus conditions for dichromats. These results suggest that dichromats may perform trichromat-like color-naming using luminance cues at higher color-processing level.

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