Articulatory-to-acoustic relations in response to speaking rate modulation in talkers with amyotrophic lateral sclerosis
Antje Mefferd, Stephanie Entz;Articulatory-to-acoustic relations in response to speaking rate modulation in talkers with amyotrophic lateral sclerosis; Journal of the Acoustical Society of America / Volume 132 / Issue 3 / PROGRAM ABSTRACTS OF THE 164TH MEETING OF THE ACOUSTICAL SOCIETY OF AMERICA; P.2090
The purpose of this study was twofold. One goal was to determine the effects of speaking rate modulation on tongue kinematic and vowel acoustic distinctiveness in talkers with amyotrophic lateral sclerosis (ALS). Another goal was to determine the strength of articulatory-to-acoustic relations in response to speaking rate modulations in talkers with ALS. Six talkers with mild ALS and six healthy controls repeated “See a kite again” at their habitual rate, at a fast rate and a slow rate. The posterior tongue motion was captured simultaneously with the acoustic signal using a 3D electromagnetic articulograph (AG500). To determine kinematic and acoustic distinctiveness maximum tongue excursions and F1/F2 vowel space distance were calculated for the diphthong “ai” in “kite.” Preliminary findings showed a greater effect of rate modulation on acoustic distinctiveness than on articulatory distinctiveness for both groups of speakers. The predictability of acoustic distinctiveness based on articulatory distinctiveness varied greatly amongst talkers of both groups. Findings provide empirical evidence of quantal relations between incremental changes of vocal tract configuration and vowel acoustics. Further, findings yield important clinical implications to improve intelligibility and potential explanations for speaking rate declines in talkers with ALS.