Event-related desynchronization and synchronization during an auditory lexical matching task

被引:47
作者
Karrasch, M [1 ]
Krause, CM
Laine, M
Lang, AH
Lehto, M
机构
[1] Abo Akad Univ, Dept Psychol, FIN-20500 Turku, Finland
[2] Univ Turku, Ctr Cognit Neurosci, Turku, Finland
[3] Univ Turku, Dept Neurol, FIN-20520 Turku, Finland
[4] Univ Turku, Dept Clin Neurophysiol, Turku, Finland
[5] Univ Turku, Dept Math, SF-20500 Turku, Finland
来源
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY | 1998年 / 107卷 / 02期
关键词
event-related desynchronization; event-related synchronization; auditory lexical matching; lexical-semantic memory; phonological memory;
D O I
10.1016/S0013-4694(98)00047-9
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Objectives: Event-related desynchronization (ERD) and synchronization (ERS) of the 8-10 and 10-12 Hz frequency bands of the background EEG were studied in 10 subjects performing an auditory lexical matching task. Methods: The stimuli were words and pseudowords presented sequentially in pairs. The subject was prompted to answer whether the two stimuli shared the same lexical status (words or pseudowords). Results: Regardless of lexicality, the presentation of the first stimulus elicited a significant late frontal ERD in both alpha frequency bands. When preceded by a pseudoword, the presentation of the second stimulus elicited a significant ERS at 200-400 ms and a significant, long-lasting and topographically-widespread ERD at 600-2200 ms in both frequency bands. When preceded by a word, the second stimulus did not elicit ERS in the initial time window, but a late ERD which was similar to the one observed in the previous condition. The complexity of ERD/ERS changes in the present task was revealed by significant interactions that time had with frequency band, stimulus type, stimulus order and lexicality of the preceding: stimulus. Conclusions: The results suggest that ERD/ERS does not reflect primary auditory stimulus processing. Rather, the ERD/ERS observed in this experiment most probably reflected task difficulty and differences between lexical-semantic and phonological memory functions. (C) 1998 Elsevier Science ireland Ltd. All rights reserved.
引用
收藏
页码:112 / 121
页数:10
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