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Syntactic processing modulates the θ rhythm of the human EEG

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Bastiaansen,  Marcel C. M.
Neurocognition of Language Processing, MPI for Psycholinguistics, Max Planck Society;
FC Donders Centre for Cognitive Neuroimaging , External Organizations;

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Van Berkum,  Jos J. A.
Neurocognition of Language Processing, MPI for Psycholinguistics, Max Planck Society;
FC Donders Centre for Cognitive Neuroimaging , External Organizations;
Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands;

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Hagoort,  Peter
Neurocognition of Language Processing, MPI for Psycholinguistics, Max Planck Society;
FC Donders Centre for Cognitive Neuroimaging , External Organizations;

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Bastiaansen_2002_Syntactic processing.pdf
(Publisher version), 320KB

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Citation

Bastiaansen, M. C. M., Van Berkum, J. J. A., & Hagoort, P. (2002). Syntactic processing modulates the θ rhythm of the human EEG. NeuroImage, 17, 1479-1492. doi:10.1006/nimg.2002.1275.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-1D75-F
Abstract
Changes in oscillatory brain dynamics can be studied by means of induced band power (IBP) analyses, which quantify event-related changes in amplitude of frequency-specific EEG rhythms. Such analyses capture EEG phenomena that are not part of traditional event-related potential measures. The present study investigated whether IBP changes in the δ, θ, and α frequency ranges are sensitive to syntactic violations in sentences. Subjects read sentences that either were correct or contained a syntactic violation. The violations were either grammatical gender agreement violations, where a prenominal adjective was not appropriately inflected for the head noun's gender, or number agreement violations, in which a plural quantifier was combined with a singular head noun. IBP changes of the concurrently measured EEG were computed in five frequency bands of 2-Hz width, individually adjusted on the basis of subjects' α peak, ranging approximately from 2 to 12 Hz. Words constituting a syntactic violation elicited larger increases in θ power than the same words in a correct sentence context, in an interval of 300–500 ms after word onset. Of all the frequency bands studied, this was true for the θ frequency band only. The scalp topography of this effect was different for different violations: following number violations a left-hemispheric dominance was found, whereas gender violations elicited a right-hemisphere dominance of the θ power increase. Possible interpretations of this effect are considered in closing.