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dc.contributor.authorMacGregor, Lucyen
dc.contributor.authorRodd, Jennifer Men
dc.contributor.authorGilbert, Beckyen
dc.contributor.authorHauk, Olafen
dc.contributor.authorSohoglu, Edizen
dc.contributor.authorDavis, Matten
dc.date.accessioned2019-11-09T00:30:42Z
dc.date.available2019-11-09T00:30:42Z
dc.date.issued2019-11-04en
dc.identifier.issn0898-929X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/298775
dc.description.abstractSemantically ambiguous words challenge speech comprehension, particularly when listeners must select a less frequent (subordinate) meaning at disambiguation. Using combined magnetoencephalography (MEG) and EEG, we measured neural responses associated with distinct cognitive operations during semantic ambiguity resolution in spoken sentences: (i) initial activation and selection of meanings in response to an ambiguous word and (ii) sentence reinterpretation in response to subsequent disambiguation to a subordinate meaning. Ambiguous words elicited an increased neural response approximately 400-800 msec after their acoustic offset compared with unambiguous control words in left frontotemporal MEG sensors, corresponding to sources in bilateral frontotemporal brain regions. This response may reflect increased demands on processes by which multiple alternative meanings are activated and maintained until later selection. Subsequent, disambiguating words heard after an ambiguous word were associated with marginally increased neural activity over bilateral temporal MEG sensors and a central cluster of EEG electrodes, which localized to similar bilateral frontal and left temporal regions. This later neural response may reflect effortful semantic integration or elicitation of prediction errors that guide reinterpretation of previously selected word meanings. Across participants, the amplitude of the ambiguity response showed a marginal positive correlation with comprehension scores, suggesting that sentence comprehension benefits from additional processing around the time of an ambiguous word. Better comprehenders may have increased availability of subordinate meanings, perhaps due to higher quality lexical representations and reflected in a positive correlation between vocabulary size and comprehension success.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.rightsAll rights reserved
dc.rights.uri
dc.titleThe Neural Time Course of Semantic Ambiguity Resolution in Speech Comprehension.en
dc.typeArticle
prism.endingPage23
prism.publicationDate2019en
prism.publicationNameJournal of cognitive neuroscienceen
prism.startingPage1
dc.identifier.doi10.17863/CAM.45831
dcterms.dateAccepted2019-10-16en
rioxxterms.versionofrecord10.1162/jocn_a_01493en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-11-04en
dc.contributor.orcidMacGregor, Lucy [0000-0002-1062-9529]
dc.contributor.orcidGilbert, Becky [0000-0003-4574-7792]
dc.contributor.orcidDavis, Matt [0000-0003-2239-0778]
dc.identifier.eissn1530-8898
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idMRC (unknown)
rioxxterms.freetoread.startdate2020-11-04


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