High-frequency cortical responses reflect lexical processing: An MEG study

被引:90
作者
Pulvermuller, F
Eulitz, C
Pantev, C
Mohr, B
Feige, B
Lutzenberger, W
Elbert, T
Birbaumer, N
机构
[1] UNIV MUNSTER, INST EXPTL AUDIOL, D-48149 MUNSTER, GERMANY
[2] UNIV PADUA, PADUA, ITALY
来源
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY | 1996年 / 98卷 / 01期
关键词
cell assembly; beta; cognitive; evoked spectral responses; gamma; language; magnetoencephalography; 30; Hz;
D O I
10.1016/0013-4694(95)00191-3
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Meaningful words and matched pseudowords, such as moon vs. noom, are of equal perceptual complexity, but invoke different cognitive processes. To investigate high-frequency cortical responses to these stimuli, biomagnetic signals were recorded simultaneously over both hemispheres of right-handed individuals listening to words and pseudowords. Consistent with earlier EEG studies, evoked spectral responses recorded from the left hemisphere revealed depression of spectral power in the low gamma band (around 30 Hz) after pseudowords but not after words. Similar differences between stimulus categories were present in the beta range. These results indicate that distinct patterns of high-frequency cortical responses correspond to the different cognitive processes invoked by words and pseudowords. It is hypothesized that differential high-frequency cortical responses signal the activation or activation failure of distributed Hebbian cell assemblies representing words and other elements of cognitive processing.
引用
收藏
页码:76 / 85
页数:10
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