Neural dissociation in processing noise and accent in spoken language comprehension
SourceNeuropsychologia, 50, 1, (2012), pp. 77
Article / Letter to editor
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Donders Centre for Cognitive Neuroimaging
PI Group Neurobiology of Language
F.C. Donders Centre for Cognitive Neuroimaging
Subject110 000 Neurocognition of Language; 110 007 PLUS: A neurocomputational model for the Processing of Linguistic Utterances based on the Unification-Space architecture; 110 009 The human brain and Chinese prosody; 110 012 Social cognition of verbal communication; 110 013 Binding and the MUC-model; 110 014 Public activities; 110 016 Auditory and articulatory brain regions in accent adaptation
We investigated how two distortions of the speech signal - added background noise and speech in an unfamiliar accent - affect comprehension of speech using functional Magnetic Resonance Imaging (fMRI). Listeners performed a speeded sentence verification task for speech in quiet in Standard Dutch, in Standard Dutch with added background noise and for speech in an unfamiliar accent of Dutch. The behavioural results showed slower responses for both types of distortion compared to clear speech, and no difference between the two distortions. The neuroimaging results showed that, compared to clear speech, processing noise resulted in more activity bilaterally in Inferior Frontal Gyrus, Frontal Operculum, while processing accented speech recruited an area in left Superior Temporal Gyrus/Sulcus. It is concluded that the neural bases for processing different distortions of the speech signal dissociate. It is suggested that current models of the cortical organisation of speech are updated to specifically associate bilateral inferior frontal areas with processing external distortions (e.g., background noise) and left temporal areas with speaker-related distortions (e.g., accents). Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
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