Neuromagntic responses to chromatic flicker: Implications for photosensitivity

Katsumi Watanabe*, Toshiaki Imada, Kenji Nihei, Shinsuke Shimojo

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (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.

本文言語English
ページ(範囲)2161-2165
ページ数5
ジャーナルNeuroReport
13
16
DOI
出版ステータスPublished - 2002 11 15
外部発表はい

ASJC Scopus subject areas

  • 神経科学(全般)

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