Neuromagntic responses to chromatic flicker: Implications for photosensitivity

Katsumi Watanabe, Toshiaki Imada, Kenji Nihei, Shinsuke Shimojo

研究成果: Article

12 引用 (Scopus)

抄録

Excessive cortical excitation due to visual stimulation often leads to photosensitive epilepsy. Here we demonstrate that even in normal subjects, prolonged stimulation with low-luminance chromatic (equiluminant) flicker evokes neuromagnetic activity in the primary visual cortex, which develops slowly (up to 1000ms) and depends on the color combination of flicker. This result suggests that chromatic sensitivity is a critical factor of cortical excitation, which can be amplified over time by a flickering stimulus. We further show that transient activity occurs in the parieto-occipital sulcus as early as 100-400 ms after flicker onset, which is negatively correlated with the later occipital activity. The early parieto-occipital activity may reflect a defensive mechanism that suppresses cortical hyperactivity due to chromatic flicker.

元の言語English
ページ(範囲)2161-2165
ページ数5
ジャーナルNeuroReport
13
発行部数16
DOI
出版物ステータスPublished - 2002 11 15
外部発表Yes

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Color
Reflex Epilepsy
Occipital Lobe
Photic Stimulation
Visual Cortex

ASJC Scopus subject areas

  • Neuroscience(all)

これを引用

Neuromagntic responses to chromatic flicker : Implications for photosensitivity. / Watanabe, Katsumi; Imada, Toshiaki; Nihei, Kenji; Shimojo, Shinsuke.

:: NeuroReport, 巻 13, 番号 16, 15.11.2002, p. 2161-2165.

研究成果: Article

Watanabe, Katsumi ; Imada, Toshiaki ; Nihei, Kenji ; Shimojo, Shinsuke. / Neuromagntic responses to chromatic flicker : Implications for photosensitivity. :: NeuroReport. 2002 ; 巻 13, 番号 16. pp. 2161-2165.
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