色選択と文字探索の複合課題中の事象関連電位に及ぼす視覚負荷と記憶負荷の効果

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  • Effects of display and memory load on the event-related potentials during visual letter search combined with selection by color.
  • イロ センタク ト モジ タンサク ノ フクゴウ カダイ チュウ ノ ジショウ カンレン デンイ ニ オヨボス シカク フカ ト キオク フカ ノ コウカ

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This study investigated the effects of display and memory load on the event-related potentials (ERPs) in a visual letter search task combined with selection by color. ERPs were recorded from 10 adult subjects, when they were required to judge if test stimuli, which consisted of a horizontal array of five colored alphabets, contained target letters defined by shape and color. The results showed that the increase of display or memory load caused the enlargement of three different negativities. The first and second display load effects were observed in the ERPs at midline central electrode (Cz) between 240-280 ms latency range, and in a posterior-distributed negativity that was the maximum at about 650 ms after the stimulus onset. The third was the anterior-central negativity that was the largest at Cz about 550 ms after the stimulus onset. In contrast to the first two effects, this negativity was enhanced by display or memory load. In discussion, a tentative linkage between these ERP changes and two slave systems of working memory (phonological loop and visuo-spatial sketchpad) was proposed.

収録刊行物

  • 心理学研究

    心理学研究 72 (4), 307-314, 2001

    公益社団法人 日本心理学会

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