Spectro-temporal correlates of lexical access during auditory lexical decision.

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TitleSpectro-temporal correlates of lexical access during auditory lexical decision.
Publication TypeJournal Article
Year of Publication2014
AuthorsBrennan, J, Lignos, C, Embick, D, Roberts, TPL
JournalBrain Lang
Date Published2014 Jun
KeywordsAdult, Alpha Rhythm, Auditory Cortex, Beta Rhythm, Comprehension, Entropy, Female, Gamma Rhythm, Humans, Magnetoencephalography, Male, Middle Aged, Repetition Priming, Speech, Speech Perception, Theta Rhythm

Lexical access during speech comprehension comprises numerous computations, including activation, competition, and selection. The spatio-temporal profile of these processes involves neural activity in peri-auditory cortices at least as early as 200 ms after stimulation. Their oscillatory dynamics are less well understood, although reports link alpha band de-synchronization with lexical processing. We used magnetoencephalography (MEG) to examine whether these alpha-related oscillations reflect the speed of lexical access, as would be predicted if they index lexical activation. In an auditory semantic priming protocol, monosyllabic nouns were presented while participants performed a lexical decision task. Spatially-localizing beamforming was used to examine spectro-temporal effects in left and right auditory cortex time-locked to target word onset. Alpha and beta de-synchronization (10-20 Hz ERD) was attenuated for words following a related prime compared to an unrelated prime beginning about 270 ms after stimulus onset. This timing is consistent with how information about word identity unfolds incrementally in speech, quantified in information-theoretic terms. These findings suggest that alpha de-synchronization during auditory word processing is associated with early stages of lexical access.

Alternate JournalBrain Lang
PubMed ID24769280
PubMed Central IDPMC4104786
Grant ListR01 DC008871 / DC / NIDCD NIH HHS / United States
R01DC008871 / DC / NIDCD NIH HHS / United States
P30 HD026979 / HD / NICHD NIH HHS / United States
P30HD026979 / HD / NICHD NIH HHS / United States
R01HD073258 / HD / NICHD NIH HHS / United States
R01 HD073258 / HD / NICHD NIH HHS / United States
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