I See What You Mean: Theta Power Increases Are Involved in the Retrieval of Lexical Semantic Information

Autor/inn/en	Bastiaansen, Marcel C. M.; Oostenveld, Robert; Jensen, Ole; Hagoort, Peter
Titel	I See What You Mean: Theta Power Increases Are Involved in the Retrieval of Lexical Semantic Information
Quelle	In: Brain and Language, 106 (2008) 1, S.15-28 (14 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0093-934X
DOI	10.1016/j.bandl.2007.10.006
Schlagwörter	Topography; Semantics; Nouns; Musicians; Medicine; Semiotics; Comparative Analysis; Neurological Organization; Visual Stimuli; Auditory Stimuli; Diagnostic Tests; Recall (Psychology) + Suchen Sie Ihr Suchwort? Topografie; Semantik; Musiker; Medizin; Semiotik; Auditive Stimulation; Diagnostic test; Diagnostischer Test; Abberufung
Abstract	An influential hypothesis regarding the neural basis of the mental lexicon is that semantic representations are neurally implemented as distributed networks carrying sensory, motor and/or more abstract functional information. This work investigates whether the semantic properties of words partly determine the topography of such networks. Subjects performed a visual lexical decision task while their EEG was recorded. We compared the EEG responses to nouns with either visual semantic properties (VIS, referring to colors and shapes) or with auditory semantic properties (AUD, referring to sounds). A time-frequency analysis of the EEG revealed power increases in the theta (4-7 Hz) and lower-beta (13-18 Hz) frequency bands, and an early power increase and subsequent decrease for the alpha (8-12 Hz) band. In the theta band we observed a double dissociation: temporal electrodes showed larger theta power increases in the AUD condition, while occipital leads showed larger theta responses in the VIS condition. The results support the notion that semantic representations are stored in functional networks with a topography that reflects the semantic properties of the stored items, and provide further evidence that oscillatory brain dynamics in the theta frequency range are functionally related to the retrieval of lexical semantic information. (Contains 7 figures.) (Author).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10