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Title:Investigating the relationship between cognitive control and speech-in-noise recognition in tinnitus from perceptual, neuroanatomical, and electrophysiological aspects
Author(s):Tai, YiHsin
Director of Research:Husain, Fatima T
Doctoral Committee Chair(s):Husain, Fatima T
Doctoral Committee Member(s):Mudar, Raksha A; Mertes, Ian B; Flaherty, Mary M
Department / Program:Speech & Hearing Science
Discipline:Speech & Hearing Science
Degree Granting Institution:University of Illinois at Urbana-Champaign
cognitive control
Abstract:Purpose: Individuals with tinnitus commonly report difficulties understanding speech in adverse listening environments. Although such speech-in-noise (SiN) difficulties are believed to relate to deficits in cognitive control, there is as yet no evidence to underpin this assumption. The aim of this dissertation was to investigate the relationship between cognitive control and SiN recognition in individuals with tinnitus and normal hearing sensitivity. Method: Three studies linking behavioral to brain imaging measures were conducted. In the first study, the effect of tinnitus pitch on the recognition of consonants in noise at various frequency ranges was examined to better understand if the tinnitus percept impacts SiN recognition. Using voxel-based morphometry, the second study investigated the relationship between SiN performance and gray matter volume in auditory and cognitive processing regions in individuals with tinnitus. Lastly, using electroencephalogram to record brain activity during Go/Nogo tasks, the third study examined whether event-related potentials related to cognitive control are associated with SiN performance in individuals with tinnitus. Results and Discussion: Overall, the findings of the three studies suggest that 1) perceiving tinnitus at a given frequency does not interfere with speech recognition at the same frequency, suggesting that the effect of tinnitus on SiN recognition may involve higher-level cognitive processes rather than being solely mediated by perceptual abilities; 2) individuals with tinnitus and normal hearing showed comparable SiN recognition and neuropsychological performance relative to hearing-matched controls, however, they still demonstrated neuroanatomical changes and neural alterations pertaining to cognitive control; and 3) individuals with tinnitus may use different cognitive control strategies relative to hearing-matched controls to maintain their performance of daily tasks. Conclusions: The findings confirmed that incorporating multimodal approaches to examine the relationship between cognitive control and SiN recognition can be beneficial to detect neuroanatomical or neural alterations before any overt changes in behavioral performance. Further, the results will serve as the baseline for future endeavors to explicitly investigate the effect of tinnitus and hearing loss on cognitive control abilities and SiN recognition, which can be invaluable in advancing tinnitus consultation and intervention.
Issue Date:2020-07-08
Rights Information:Copyright 2020 Yihsin Tai
Date Available in IDEALS:2020-10-07
Date Deposited:2020-08

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