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http://dx.doi.org/10.13064/KSSS.2017.9.3.085

Acoustic parameter delta of an aspirated voice in stroke patients  

Kang, Young Ae (충남대학교병원 이비인후과)
Jee, Sung Ju (충남대학교병원 재활의학과)
Koo, Bon Seok (충남대학교병원 이비인후과)
Jo, Cheolwoo (창원대학교 메카트로닉스대학 전기전자제어공학부)
Publication Information
Phonetics and Speech Sciences / v.9, no.3, 2017 , pp. 85-91 More about this Journal
Abstract
The present study aimed to investigate the changes of acoustic parameters of the aspirated voice in stroke patients. The eighty-eight subjects diagnosed with cerebro-vascular accident were divided into 32 penetration/aspiration (P/A) and 56 Non-P/A groups according to the videofluroscopic swallowing study (VFSS) results, and 26 control subjects participated. All subjects preformed VFSS and vowel /a/ was recorded three times pre- and post VFSS. Since the variation in the acoustic parameters within a single phonation has been observed, we proposed a delta formula for the acoustic parameters which can reflect the temporal changes of the each parameter in an utterance. We measured from the voice data eight acoustic parameters: fundamental frequency (F0), standard deviation of F0 (F0_SD), Jitter, relative average perturbation (RAP), Shimmer, amplitude perturbation quotient (APQ), harmonic to noise ration (HNR), noise to harmonic ratio (NHR). Then we found parameters which show the meaningful biggest temporal change in an utterance using the suggested delta parameter. Among them, the deltas of shimmer and APQ were significantly different pre- and post VFSS. These deltas of the P/A and the control group were increased after VFSS, while those of the Non-P/A group was descended. The variation patterns of the P/A and the control group were similar but the change width of the P/A group was larger. The large variations in an aspirated phonation of the P/A group are thought to be caused by irregular changes in air resistance due to residual food on the vocal cords.
Keywords
Acoustic analysis; swallowing disorders; videofluoroscopic swallowing study; penetration; aspiration;
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