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ERPs, Semantic Processing and Age

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Title: ERPs, Semantic Processing and Age
Other Titles: 事象関連電位並びに意味情報処理と加齢
Authors: Miyamoto, Tamaki1 Browse this author
Authors(alt): 宮本, 環1
Keywords: ERP
semantic processing
Issue Date: 25-Mar-1998
Publisher: Hokkaido University
Abstract: ERPs (N400, LPC and CNV) were elicited in two sets of subjects grouped according to age (young vs. elderly) using a word-pair category matching paradigm. Each prime consisted of a Japanese noun (constructed from 2-4 characters of the Hiragana) followed by one Chinese character (Kanji) as the target, this latter representing one of five semantic categories. There were two equally probable target conditions: match or mismatch. Each target was preceded by a prime, either belonging to, or not belonging to, the same semantic category. The subjects were required to respond with a specified button press to the given target according to the condition. We found RTs to be longer in the elderly subjects and under the mismatch condition. N400 amplitude was reduced in the elderly subjects under the mismatch condition, and there was no difference between match and mismatch response, which were similar in amplitude to that under match condition for the young subjects. In addition, the CNV amplitudes were larger in the elderly subjects. These results suggested that functional changes in semantic processing through aging (larger semantic networks and diffuse semantic activation) were the cause of this N400 reduction, attributing a subsidiary role to attentional disturbance. We also discuss the importance of taking age-related changes into consideration in clinical studies.
Description: Running head: ERP and age 共著者あり。共著者名:Katayama Jun'ichi, Koyama Tsukasa
Conffering University: 北海道大学
Degree Report Number: 乙第5292号
Degree Level: 博士
Degree Discipline: 医学
Type: theses (doctoral)
Appears in Collections:学位論文 (Theses) > 博士 (医学)

Submitter: 宮本 環

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