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The interplay between prior knowledge and semantic coherence during processing of degraded speech: an fMRI study
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences. (Linnaeus Centre HEAD)ORCID iD: 0000-0001-8903-7931
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Swedish Institute for Disability Research. School of Communication Sciences and Disorders, University of Western Ontario, Canada. (Linnaeus Centre HEAD)ORCID iD: 0000-0002-7810-1333
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences. (Linnaeus Centre HEAD)
2015 (English)In: Abstract book: Third International Conference on Cognitive Hearing Science for Communication, 2015, 181-181 p.Conference paper, Poster (Other academic)
Abstract [en]

Degraded speech is rendered more intelligible both by semantic coherence and preceding text cues. Recently, we showed that the perceptual clarity of noise-vo-coded speech (NVS) is still enhanced by semantic coherence when cues are provided and that prior knowledge enhances perceptual clarity of NVS when semantic coherence is low (Signoret et al., 2015). Here, we investigated the neural correlates of this interaction. Twenty participants listened to sentences and performed an unrelated attentional task during sparse-imaging fMRI. The sentences had high or low semantic coherence, and were either clear, degraded (6-band NV) or unintelligible (1-band NV). Each spoken word was preceded (200 ms) by either a matching cue or a consonant string. Preliminary results revealed significant main effects of both Coherence and Cue in the superior temporal gyrus bilaterally and a significant interaction between Coherence and Cue when speech was degraded, in superior and middle temporal gyri bilaterally and left precentral gyrus. Investigation of this interaction revealed greater activation for high compared to low coherent sentences when cues were provided in the left-lateralized regions and greater activation without than with cues when semantic coherence was low in bilateral regions. The opposite contrasts elicited no significant activation. This pattern of results indicates that the increases in perceptual clarity of NVS attributable to semantic coherence and prior knowledge are supported by similar neural mechanisms organized in bilateral temporal regions, but that when perceptual clarity is optimized by both factors, it is supported by left-lateralized mechanisms.

Place, publisher, year, edition, pages
2015. 181-181 p.
National Category
Psychology
Identifiers
URN: urn:nbn:se:liu:diva-123963OAI: oai:DiVA.org:liu-123963DiVA: diva2:894517
Conference
Third International Conference on Cognitive Hearing Science for Communication (CHSCOM2015), Linköping, Sweden, 14–17 June 2015
Available from: 2016-01-15 Created: 2016-01-15 Last updated: 2016-01-15Bibliographically approved

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Signoret, CarineAndin, JosefineJohnsrude, IngridRudner, Mary
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The Swedish Institute for Disability ResearchDisability ResearchFaculty of Arts and Sciences
Psychology

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ReferencesLink to record
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