Articulatory kinematics in response to loudness and Parkinson's disease
Abstract
Purpose. Changes in the displacement and velocity of the articulators has been documented in individuals with Parkinson’s disease as compared to older adults. These changes have been in response to loudness and rate manipulations. Individuals with PD are highly susceptible to cueing, however articulatory changes based on different types of cues to achieve the same goal have not been studied. Thus, the purpose of the current study was to observe changes in the articulatory patterns of individuals with PD as compared to control participants across several different cues to increase loudness. Methods. Nine individuals diagnosed with idiopathic Parkinson’s disease (PD) and 9 age- and sex-matched healthy older adults served as the participants in this study. Participants produced two sentences in the following four conditions: (1) comfortable, (2) while targeting 10 dB SPL above their comfortable loudness using an SPL meter as feedback, (3) at a level that they perceive to be as “twice as loud” as their comfortable loudness level, (4) while multitalker noise was played in the background. Lip and jaw kinematics and acoustic measurements were obtained. Results. Both groups significantly increased mean SPL from comfortable to the three loudness conditions. Older adults produced the smallest articulatory movements in targeting condition while individuals with PD produced the smallest articulatory movements in background noise condition. Trends for individuals with PD to have smaller articulatory movements and decreased articulatory stability than control participants were observed. Conclusions. Older adults and individuals with PD altered articulatory movement patterns in response to cues to increase loudness. These groups also reacted to the different cues to increase loudness in different ways. While changes in SPL could explain the differences in kinematics for the older adults, they do not explain the differences in kinematics for the individuals with PD. Although significant differences were not found between older adults and individuals with PD in regard to articulatory displacement and velocity and articulatory variability, data trends indicate a need for further investigation.
Degree
M.S.
Advisors
Huber, Purdue University.
Subject Area
Speech therapy
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