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

Show full item record



Permalink

http://hdl.handle.net/10138/225792

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 . https://doi.org/10.1002/brb3.789

Title: Predictive processing increases intelligibility of acoustically distorted speech : Behavioral and neural correlates
Author: Hakonen, Maria; May, Patrick J. C.; Jaaskelainen, Iiro P.; Jokinen, Emma; Sams, Mikko; Tiitinen, Hannu
Contributor: University of Helsinki, Medicum
University of Helsinki, BioMag Laboratory
Date: 2017-09
Language: eng
Number of pages: 15
Belongs to series: Brain and Behavior
ISSN: 2162-3279
URI: http://hdl.handle.net/10138/225792
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.
Subject: acoustic distortion
comprehension
functional magnetic resonance imaging
intelligibility
memory
speech
ADVERSE LISTENING CONDITIONS
HUMAN AUDITORY-CORTEX
DEGRADED SPEECH
WORKING-MEMORY
COGNITIVE CONTROL
EPISODIC MEMORY
VISUAL-CORTEX
BRAIN IMAGES
NOISE
PERCEPTION
3112 Neurosciences
3124 Neurology and psychiatry
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
Hakonen_et_al_2017_Brain_and_Behavior.pdf 993.4Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record