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The study aimed at understanding the articulatory stability differences between voiced and unvoiced labiodental sequences in persons with stuttering and age, gender matched typical adults. Group 1 consisted of 10 males in the age range of 18-30 years who were diagnosed to have stuttering from a qualified Speech-Language Pathologist using Stuttering Severity Instrument. Group 2 consisted of age, gender matched typical adults. Individuals with positive history of speech, language and hearing deficits and those who were undergoing medical interventions for anxiety reduction were ruled out from the study. Articulograph AG501 was used to capture the articulatory movements of the participants. During the experimental trials electromagnetic sensitive sensors were glued onto Lower Lip (LL) and Jaw articulators of the participants and were instructed to repeat bisyllabic labiodental sequences in their habitual speaking rate and loudness. To compute the articulatory stability Spatiotemporal Index (STI) was computed which is a cumulative variability measures of spatial and temporal domains for 10 fluent iterations. Comparison of mean STI scores revealed high articulatory consistency in the unvoiced sequences compared to voiced labiodental sequences. Additionally jaw stability was poorer in Persons with Stuttering compared to age, gender matched typical adults. Study findings were discussed from the viewpoint of dyscoordination of speech subsystems in Persons with Stuttering.
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