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ID 29421
file
title alternative
Effects of the variability of stimulus onset asynchrony on a lexical decision
creator
Nakao, Mizuki
Yamamoto, Fumie
Maedo, Shino
subject
Lexical decision
Simple reaction
Stimulus onset asynchrony
ERP
語彙判断
単純反応
刺激時問間隔
事象関連電位
NDC
Psychology
abstract
We investigated the effect of the variability of time interval between a prime and a target on reaction times and event-related brain potentials (ERPs) in a lexical decision task. In Experiment I, thirty six graduates and undergraduates read silently a prime, and classified a target into word or non-word. The stimulus onset asynchrony (SOA) between the prime and the target was 500, 1000, or 2000 ms. For a half of participants, SOA was fixed within a experimental block, while three SOA conditions were randomly mixed within a block for another half of participants. The results show that the reaction times were shorter when the target was semantically related to the prime than when the former was unrelated to the latter. The degree of this semantic priming effect was not influenced by the variability of SOA. In Experiment II, we recorded scalp ERPs from 20 graduates and undergraduates who participated in the same task as Experiment I. The results of reaction times showed a replication of Experiment I. Two negative deflections of ERPs (N375 and N450) sensitive to semantic relation between prime and target were identified. Neither the amplitude nor the latency of peaks of these deflection changed according to the variability of SOA. These results suggested that a temporal aspect of controlled attention would not affect the enhancement of selectivity based on semantic information.
journal title
Bulletin of the Faculty of Education, Hiroshima University. Part 3, Education and human science
issue
Issue 49
start page
199
end page
206
date of issued
2001-02-28
publisher
広島大学教育学部
issn
0919-8652
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Education
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