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

Miyatani Makoto

Akai Toshiyuki

広島大学教育学部紀要. 第一部, 心理学

Bulletin of the Faculty of Education, Hiroshima University. Part 1, Psychology division

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.

visual search

varied mapping

consistent mapping

event-related potentials (ERPs)

search negativity

Psychology [ 140 ]

jpn

広島大学教育学部

[ISSN] 0919-8652

[NCID] AN1044240X