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    Auditory semantic processing in dichotic listening: effects of competing speech, ear of presentation, and sentential bias on N400s to spoken words in context

    Carey, Daniel and Mercure, E. and Pizzioli, F. and Aydelott, Jennifer (2014) Auditory semantic processing in dichotic listening: effects of competing speech, ear of presentation, and sentential bias on N400s to spoken words in context. Neuropsychologia 65 , pp. 102-112. ISSN 0028-3932.

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    Abstract

    The effects of ear of presentation and competing speech on N400s to spoken words in context were examined in a dichotic sentence priming paradigm. Auditory sentence contexts with a strong or weak semantic bias were presented in isolation to the right or left ear, or with a competing signal presented in the other ear at a SNR of −12 dB. Target words were congruent or incongruent with the sentence meaning. Competing speech attenuated N400s to both congruent and incongruent targets, suggesting that the demand imposed by a competing signal disrupts the engagement of semantic comprehension processes. Bias strength affected N400 amplitudes differentially depending upon ear of presentation: weak contexts presented to the le/RH produced a more negative N400 response to targets than strong contexts, whereas no significant effect of bias strength was observed for sentences presented to the re/LH. The results are consistent with a model of semantic processing in which the RH relies on integrative processing strategies in the interpretation of sentence-level meaning.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): N400, Dichotic sentence processing, Semantic bias, Competing speech, Lateralisation
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 06 Nov 2014 09:43
    Last Modified: 06 Nov 2014 09:43
    URI: http://eprints.bbk.ac.uk/id/eprint/10903

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