広島大学教育学部紀要. 第一部, 心理学 Issue 42
published_at 1994-03-10

マッピング条件が異なる視覚的探索課題における事象関連電位

Event-related potentials in varied-and consistent-mapping visual search
Akai Toshiyuki
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BullFacEdu-HiroshimaUniv-Pt1-PsychDiv_42_1.pdf
Abstract
This study investigated the effects of display load (number of positions to be processed) on event-related. potentials (ERPs) during visual search in different mapping conditions. ERPs were recorded from nine adult subjects, who were required to respond if stimuli, which consisted of a horizontal array of five different characters, contained target numbers (consistent-mapping, CM) or target alphabets (varied-mapping, VM). In VM conditions, P300 latency increased and P300 amplitude reduced with increasing display load. Larger display load also resulted in enlargement of search-related negativity. But in contrast, in CM conditions, display load did not affect P300s, nor increase search-related negativity over the whole scalp. The sequential changes of topography of search-related negativity in VM conditions suggests that this negativity may contain three deflections which differed in topography and the time course. A tentative linkage was suggested between the psychological processes involved in the visual search and these deflections as well as the fronto-central N310 and the occipital N190, which were affected by display load both in VM and CM search tasks.
Keywords
visual search
varied mapping
consistent mapping
event-related potentials (ERPs)
search negativity