Pulvermüller F, Eulitz C, Pantev C, Mohr B, Feige B, Lutzenberger W, Elbert T, Birbaumer N
Institut für Medizinische Psychologie und Verhaltensneurobiologie, Universität Tübingen, Germany.
Electroencephalogr Clin Neurophysiol. 1996 Jan;98(1):76-85. doi: 10.1016/0013-4694(95)00191-3.
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.
有意义的单词和匹配的假词，如moon（月亮）与noom，具有相同的感知复杂性，但会引发不同的认知过程。为了研究对这些刺激的高频皮层反应，在右利手个体听单词和假词时，同时记录其两个半球的生物磁信号。与早期的脑电图研究一致，从左半球记录的诱发频谱反应显示，听假词后低伽马波段（约30赫兹）的频谱功率降低，而听单词后则没有。刺激类别之间的类似差异也出现在贝塔波段。这些结果表明，高频皮层反应的不同模式对应于单词和假词所引发的不同认知过程。据推测，高频皮层反应的差异表明代表单词和认知处理其他元素的分布式赫布细胞集合的激活或激活失败。
