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Kurosu, Atsuko (2019) INVESTIGATION OF EMBODIED LANGUAGE PROCESSING ON COMMAND-SWALLOW PERFORMANCE. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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In the command swallow condition, which is routinely employed during videofluoroscopic examination of swallowing, patients commonly are told to hold a bolus in their mouth until they are told to swallow. Both components of the command swallow, bolus hold and swallowing in response to a command, could influence the act of swallowing. The focus of the current study was to examine the linguistic influences of the verbal command on swallowing. In fact, the language induced motor facilitation theory suggests the linguistic processes associated with the verbal command should facilitate the voluntary component of swallowing.
This study investigated whether language induced motor facilitation was evident under the command swallow condition as reflected in suprahyoid muscle activity measured by surface electromyography. During the experiment, 20 healthy young participants held a 5 ml liquid bolus in their mouth and swallowed the bolus after hearing 5 acoustic stimuli presented randomly: congruent action word (swallow), incongruent action word (cough), congruent pseudo-word (spallow), incongruent pseudo-word (pough), and non-verbal stimulus (1000 Hz pure-tone).
Swallow latencies following the congruent action word were shorter than swallows following the non-verbal stimulus, indicating that suprahyoid muscle activity occurred earlier for
following the word swallow than for the pure-tone. Longer latencies for the pseudo-words than real words also supported the language induced motor facilitation theory, but it was not clear whether the observed differences were due to reduced linguistic facilitation or longer processing-time associated with interference. Stronger support for the theory captured by lexical directionality was not evident when the words swallow and cough were compared. The facilitation effects of swallow-related action words may not have sufficient sensitivity and strength among effectors, and the incongruent word in the study may not have represented a true incongruent action against the act of swallowing. There also was no facilitation effect on peak suprahyoid muscle activity amplitude.
The evidence from this study advances our understanding of the links between language and movement for behaviors that are not entirely under voluntary control. Linguistic inducement of swallowing could be useful as a swallow compensatory technique for patients with difficulty initiating oropharyngeal swallows including patients with Parkinson’s disease.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Kurosu, Atsukoatk22@pitt.eduatk22
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairPratt, Sheilaspratt@pitt.eduspratt
Committee MemberPalmer, Catherinepalmercv@upmc.edupalmercv
Committee MemberShaiman, Susanshaiman@pitt.edushaiman
Fiez, Juliefiez@pitt.edufiez
Date: 17 January 2019
Date Type: Publication
Defense Date: 13 September 2018
Approval Date: 17 January 2019
Submission Date: 13 November 2018
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 240
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Communication Science and Disorders
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: swallowing,deglutition,embodied language processing,surface electromyography
Date Deposited: 17 Jan 2019 15:54
Last Modified: 17 Jan 2019 15:54


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