Predictive processing increases intelligibility of acoustically distorted speech : Behavioral and neural correlates

Show simple item record Hakonen, Maria May, Patrick J. C. Jaaskelainen, Iiro P. Jokinen, Emma Sams, Mikko Tiitinen, Hannu 2017-10-13T08:22:00Z 2017-10-13T08:22:00Z 2017-09
dc.identifier.citation Hakonen , M , May , P J C , Jaaskelainen , I P , Jokinen , E , Sams , M & Tiitinen , H 2017 , ' Predictive processing increases intelligibility of acoustically distorted speech : Behavioral and neural correlates ' , Brain and Behavior , vol. 7 , no. 9 , 00789 .
dc.identifier.other PURE: 90982653
dc.identifier.other PURE UUID: 02616e58-dfa0-4c58-b0a2-d83a024cfd1b
dc.identifier.other WOS: 000411368500020
dc.identifier.other Scopus: 85026772342
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 have the highest probability to be correct based on previous experience. en
dc.format.extent 15
dc.language.iso eng
dc.relation.ispartof Brain and Behavior
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject acoustic distortion
dc.subject comprehension
dc.subject functional magnetic resonance imaging
dc.subject intelligibility
dc.subject memory
dc.subject speech
dc.subject VISUAL-CORTEX
dc.subject BRAIN IMAGES
dc.subject NOISE
dc.subject PERCEPTION
dc.subject 3112 Neurosciences
dc.subject 3124 Neurology and psychiatry
dc.title Predictive processing increases intelligibility of acoustically distorted speech : Behavioral and neural correlates en
dc.type Article
dc.contributor.organization Medicum
dc.contributor.organization Department of Physiology
dc.contributor.organization BioMag Laboratory
dc.contributor.organization HUS Medical Imaging Center
dc.description.reviewstatus Peer reviewed
dc.relation.issn 2162-3279
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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