Predictive processing increases intelligibility of acoustically distorted speech

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Hakonen, Maria May, Patrick J.C. Jääskeläinen, Iiro Jokinen, Emma Sams, Mikko Tiitinen, Hannu 2017-10-15T20:38:38Z 2017-10-15T20:38:38Z 2017-09
dc.identifier.citation Hakonen , M , May , P J C , Jääskeläinen , I , Jokinen , E , Sams , M & Tiitinen , H 2017 , ' Predictive processing increases intelligibility of acoustically distorted speech : Behavioral and neural correlates ' BRAIN AND BEHAVIOR , pp. 1-15 . DOI: 10.1002/brb3.789 en
dc.identifier.issn 2162-3279
dc.identifier.other PURE UUID: 5856d32b-2f40-4316-b6bc-8d171f905b9d
dc.identifier.other PURE ITEMURL:
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dc.description.abstract Introduction: We examined which brain areas are involved in the comprehension of acoustically distorted speech using an experimental paradigm where the same distorted sentence can be perceived at different levels of intelligibility. This change in intelligibility occurs via a single intervening presentation of the intact version of the sentence, and the effect lasts at least on the order of minutes. Since the acoustic structure of the distorted stimulus is kept fixed and only intelligibility is varied, this allows one to study brain activity related to speech comprehension specifically. Methods: In a functional magnetic resonance imaging (fMRI) experiment, a stimulus set contained a block of six distorted sentences. This was followed by the intact counterparts of the sentences, after which the sentences were presented in distorted form again. A total of 18 such sets were presented to 20 human subjects. Results: The blood oxygenation level dependent (BOLD)-responses elicited by the distorted sentences which came after the disambiguating, intact sentences were contrasted with the responses to the sentences presented before disambiguation. This revealed increased activity in the bilateral frontal pole, the dorsal anterior cingulate/paracingulate cortex, and the right frontal operculum. Decreased BOLD responses were observed in the posterior insula, Heschl’s gyrus, and the posterior superior temporal sulcus. Conclusions: The brain areas that showed BOLD-enhancement for increased sentence comprehension have been associated with executive functions and with the mapping of incoming sensory information to representations stored in episodic memory. Thus, the comprehension of acoustically distorted speech may be associated with the engagement of memory-related subsystems. Further, activity in the primary auditory cortex was modulated by prior experience, possibly in a predictive coding framework. Our results suggest that memory biases the perception of ambiguous sensory information toward interpretations that havethe highest probability to be correct based on previous experience. en
dc.format.extent 15
dc.format.extent 1-15
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries BRAIN AND BEHAVIOR en
dc.rights openAccess en
dc.subject.other Neuroscience(all) en
dc.subject.other 3112 Neurosciences en
dc.title Predictive processing increases intelligibility of acoustically distorted speech en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Neuroscience and Biomedical Engineering
dc.contributor.department University of Nottingham
dc.contributor.department Department of Signal Processing and Acoustics
dc.subject.keyword Acoustic distortion
dc.subject.keyword comprehension
dc.subject.keyword fMRI
dc.subject.keyword Intelligibility
dc.subject.keyword memory
dc.subject.keyword Speech
dc.subject.keyword Neuroscience(all)
dc.subject.keyword 3112 Neurosciences
dc.identifier.urn URN:NBN:fi:aalto-201710157054
dc.identifier.doi 10.1002/brb3.789
dc.type.version proof

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