Theta responses are involved in lexical-semantic retrieval during language processing

MCM Bastiaansen, M van der Linden, M ter Keurs, T Dijkstra, P. Hagoort

Research output: Contribution to journalArticleScientificpeer-review


Oscillatory neuronal dynamics, observed in the human electroencephalogram (EEG) during language processing, have been related to the dynamic formation of functionally coherent networks that serve the role of integrating the different sources of information needed for understanding the linguistic input. To further explore the functional role of oscillatory synchrony during language processing, we quantified event-related EEG power changes induced by the presentation of open-class (OC) words and closed-class (CC) words in a wide range of frequencies (from 1 to 30 Hz), while subjects read a short story. Word presentation induced three oscillatory components: a theta power increase (4–7 Hz), an alpha power decrease (10– 12 Hz), and a beta power decrease (16–21 Hz). Whereas the alpha and beta responses showed mainly quantitative differences between the two word classes, the theta responses showed qualitative differences between OC words and CC words: A theta power increase was found over left temporal areas for OC words, but not for CC words. The left temporal theta increase may index the activation of a network involved in retrieving the lexical semantic properties of the OC items.
Original languageEnglish
Pages (from-to)530-541
JournalJournal of Cognitive Neuroscience
Issue number3
Publication statusPublished - 2005
Externally publishedYes


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