Previous exposure to intact speech increases intelligibility of its digitally degraded counterpart as a function of stimulus complexity

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Hakonen, Maria
dc.contributor.author May, Patrick J.C.
dc.contributor.author Alho, Jussi
dc.contributor.author Alku, Paavo
dc.contributor.author Jokinen, Emma
dc.contributor.author Jääskeläinen, Iiro P.
dc.contributor.author Tiitinen, Hannu
dc.date.accessioned 2017-05-31T09:55:32Z
dc.date.available 2017-05-31T09:55:32Z
dc.date.issued 2015
dc.identifier.citation Hakonen, Maria & May, Patrick J.C. & Alho, Jussi & Alku, Paavo & Jokinen, Emma & Jääskeläinen, Iiro P. & Tiitinen, Hannu. 2015. Previous exposure to intact speech increases intelligibility of its digitally degraded counterpart as a function of stimulus complexity. NeuroImage. 131-143. ISSN 1053-8119 (printed). DOI: 10.1016/j.neuroimage.2015.10.029. en
dc.identifier.issn 1053-8119 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/26562
dc.description.abstract Recent studies have shown that acoustically distorted sentences can be perceived as either unintelligible or intelligible depending on whether one has previously been exposed to the undistorted, intelligible versions of thesentences. This allows studying processes specifically related to speech intelligibility since any change betweenthe responses to the distorted stimuli before and after the presentation of their undistorted counterparts cannotbe attributed to acoustic variability but, rather, to the successful mapping of sensory information onto memoryrepresentations. To estimate how the complexity of the message is reflected in speech comprehension, we appliedthis rapid change in perception to behavioral and magnetoencephalography (MEG) experiments usingvowels, words and sentences. In the experiments, stimuli were initially presented to the subject in a distortedform, after which undistorted versions of the stimuli were presented. Finally, the original distorted stimuliwere presented once more. The resulting increase in intelligibility observed for the second presentation of thedistorted stimuli depended on the complexity of the stimulus: vowels remained unintelligible (behaviorallymeasured intelligibility 27%) whereas the intelligibility of the words increased from 19% to 45% and that of thesentences from31% to 65%. This increase in the intelligibility of the degraded stimuliwas reflected as an enhancementof activity in the auditory cortex and surrounding areas at early latencies of 130–160 ms. In the same regions,increasing stimulus complexity attenuated mean currents at latencies of 130–160 ms whereas atlatencies of 200–270 ms the mean currents increased. These modulations in cortical activity may reflect feedbackfromtop-down mechanismsenhancing the extraction of information fromspeech. The behavioral results suggestthat memory-driven expectancies can have a significant effect on speech comprehension, especially in acousticallyadverse conditions where the bottom-up information is decreased. en
dc.format.extent 131-143
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier BV en
dc.relation.ispartofseries NeuroImage en
dc.rights © 2015 Elsevier BV. This is the post print version of the following article: Hakonen, Maria & May, Patrick J.C. & Alho, Jussi & Alku, Paavo & Jokinen, Emma & Jääskeläinen, Iiro P. & Tiitinen, Hannu. 2015. Previous exposure to intact speech increases intelligibility of its digitally degraded counterpart as a function of stimulus complexity. NeuroImage. 131-143. ISSN 1053-8119 (printed). DOI: 10.1016/j.neuroimage.2015.10.029, which has been published in final form at http://www.sciencedirect.com/science/article/pii/S1053811915009398. en
dc.subject.other Psychology en
dc.title Previous exposure to intact speech increases intelligibility of its digitally degraded counterpart as a function of stimulus complexity en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder Elsevier BV
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Neurotieteen ja lääketieteellisen tekniikan laitos fi
dc.contributor.department Department of Neuroscience and Biomedical Engineering en
dc.subject.keyword speech en
dc.subject.keyword comprehension en
dc.subject.keyword intelligibility en
dc.subject.keyword acoustic distortion en
dc.subject.keyword magnetoencephalography en
dc.subject.keyword auditory neuroscience en
dc.identifier.urn URN:NBN:fi:aalto-201510274786
dc.type.dcmitype text en
dc.identifier.doi 10.1016/j.neuroimage.2015.10.029
dc.contributor.lab Brain and Mind laboratory en
dc.contributor.lab Aivot ja Mieli laboratorio fi
dc.type.version Post print en


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