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  Alpha and theta brain oscillations index dissociable processes in spoken word recognition

Strauss, A., Kotz, S. A., Scharinger, M., & Obleser, J. (2014). Alpha and theta brain oscillations index dissociable processes in spoken word recognition. NeuroImage, 97, 387-395. doi:10.1016/j.neuroimage.2014.04.005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-85D7-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-82BF-3
Genre: Journal Article

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 Creators:
Strauss, Antje1, Author              
Kotz, Sonja A.2, 3, Author              
Scharinger, Mathias1, Author              
Obleser, Jonas1, Author              
Affiliations:
1Max Planck Research Group Auditory Cognition, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_751545              
2Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              
3School of Psychological Sciences, The University of Manchester, United Kingdom, ou_persistent22              

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Free keywords: Time–frequency analysis; Lexical decision; EEG; Source localization; Slow
 Abstract: Slow neural oscillations (~ 1–15 Hz) are thought to orchestrate the neural processes of spoken language comprehension. However, functional subdivisions within this broad range of frequencies are disputed, with most studies hypothesizing only about single frequency bands. The present study utilizes an established paradigm of spoken word recognition (lexical decision) to test the hypothesis that within the slow neural oscillatory frequency range, distinct functional signatures and cortical networks can be identified at least for theta- (~ 3–7 Hz) and alpha-frequencies (~ 8–12 Hz). Listeners performed an auditory lexical decision task on a set of items that formed a word–pseudoword continuum: ranging from (1) real words over (2) ambiguous pseudowords (deviating from real words only in one vowel; comparable to natural mispronunciations in speech) to (3) pseudowords (clearly deviating from real words by randomized syllables). By means of time–frequency analysis and spatial filtering, we observed a dissociation into distinct but simultaneous patterns of alpha power suppression and theta power enhancement. Alpha exhibited a parametric suppression as items increasingly matched real words, in line with lowered functional inhibition in a left-dominant lexical processing network for more word-like input. Simultaneously, theta power in a bilateral fronto-temporal network was selectively enhanced for ambiguous pseudowords only. Thus, enhanced alpha power can neurally ‘gate’ lexical integration, while enhanced theta power might index functionally more specific ambiguity-resolution processes. To this end, a joint analysis of both frequency bands provides neural evidence for parallel processes in achieving spoken word recognition.

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Language(s): eng - English
 Dates: 2014-04-032014-04-182014-08-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.neuroimage.2014.04.005
PMID: 24747736
Other: Epub 2014
 Degree: -

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Title: NeuroImage
Source Genre: Journal
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Pages: - Volume / Issue: 97 Sequence Number: - Start / End Page: 387 - 395 Identifier: ISSN: 1053-8119
CoNE: /journals/resource/954922650166