Spatiotemporal movement variability in ALS: Speaking rate effects on tongue, lower lip, and jaw motor control

Journal of Communication Disorders
Mili Kuruvilla-Dugdale, Antje S Mefferd

Abstract

Although it is frequently presumed that bulbar muscle degeneration in Amyotrophic Lateral Sclerosis (ALS) is associated with progressive loss of speech motor control, empirical evidence is limited. Furthermore, because speaking rate slows with disease progression and rate manipulations are used to improve intelligibility in ALS, this study sought to (i) determine between and within-group differences in articulatory motor control as a result of speaking rate changes and (ii) identify the strength of association between articulatory motor control and speech impairment severity. Ten talkers with ALS and 11 healthy controls repeated the target sentence at habitual, fast, and slow rates. The spatiotemporal variability index (STI) was calculated to determine tongue, lower lip, and jaw movement variability. During habitual speech, talkers with mild-moderate dysarthria displayed significantly lower tongue and lip movement variability whereas those with severe dysarthria showed greater variability compared to controls. Within-group rate effects were significant only for talkers with ALS. Specifically, lip and tongue movement variability significantly increased during slow speech relative to habitual and fast speech. Finally, preliminary...Continue Reading

Citations

Aug 23, 2019·Journal of Speech, Language, and Hearing Research : JSLHR·Panying Rong
Jan 16, 2020·Journal of Speech, Language, and Hearing Research : JSLHR·Panying Rong
Sep 27, 2018·International Journal of Speech-language Pathology·Panying RongJordan R Green
Nov 26, 2019·Logopedics, Phoniatrics, Vocology·Rita Chiaramonte, Marco Bonfiglio
Jul 1, 2020·Journal of Speech, Language, and Hearing Research : JSLHR·Mili Kuruvilla-DugdaleAntje S Mefferd
Feb 26, 2021·American Journal of Speech-language Pathology·Panying Rong, Lindsey Heidrick
Mar 1, 2021·The Journal of the Acoustical Society of America·A SlisL Lancia
Apr 8, 2021·American Journal of Speech-language Pathology·Julie Case, Maria I Grigos
Sep 20, 2018·Folia Phoniatrica Et Logopaedica : Official Organ of the International Association of Logopedics and Phoniatrics (IALP)·Yunjung KimJeffrey Berry

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