Neuromagnetic correlates of perceived brightness in human visual cortex

Aki Kondo, Hiroyuki Tsubomi, Katsumi Watanabe

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We used magnetoencephalography (MEG) to investigate the timing and location of cortical activity related to perceived brightness. Participants passively observed 1 of 5 disks of different luminance (1,3.2, 10,32, and 100 cd/m 2) during MEG recording, and rated the perceived brightness of the disk before and after the MEG recording. The perceived brightness showed an almost perfect log-linear dependence on luminance intensity. The MEG results showed that the stimulus presentation evoked neuromagnetic responses in the occipital region approximately 150 ms after stimulus onset. The average magnitude of the response was positively correlated with the subjective ratings of perceived brightness as well as the log-scaled stimulus luminance. These findings suggest that the neuromagnetic responses in the occipital cortex reflect subjective brightness perception and that the visual cortex completes the brightness assignment as early as 150 ms after stimulus onset. The possible clinical application of these results is discussed.

本文言語English
ページ(範囲)267-275
ページ数9
ジャーナルPsychologia
53
4
DOI
出版ステータスPublished - 2010 12
外部発表はい

ASJC Scopus subject areas

  • Psychology(all)

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