The effect of dynamic visual noise on event-related potential component reflecting concrete word processing

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  • 動的視覚ノイズが具象語の処理を反映するＥＲＰ成分に及ぼす影響
  • ドウテキ シカク ノイズ ガ グショウゴ ノ ショリ オ ハンエイ スル ERP セイブン ニ オヨボス エイキョウ

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Abstract

To examine how and when a visual imagery process is involved with word processing, we investigated the effects of visual imagery disruption on the event-related potentials (ERP) elicited by concrete and abstract words. Twelve healthy adults participated in this experiment, for which they were required to judge the imageability of auditorily presented noun stimuli. Of the participants, half were presented with dynamic visual noise (DVN) during the task; half were presented with a graycolored static screen (control group). Results showed that the ERPs to concrete words were more negative relative to the ERPs to abstract words in early and late time windows. In the early time window, a significant negative shift effect was found in the control group, but not in the DVN group. In the late time window, the negative shift was not significant in either group. Results suggest that the negative shift effect in the early time window reflects a qualitative difference between the processing of concrete and abstract words, and the contribution of visual imagery processing to concrete word processing.

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