Intact Correction for Self-Produced Vowel Formant Variability in Individuals with Cerebellar Ataxia Regardless of Auditory Feedback Availability

Autor/inn/en	Parrell, Benjamin; Ivry, Richard B.; Nagarajan, Srikantan S.; Houde, John F.
Titel	Intact Correction for Self-Produced Vowel Formant Variability in Individuals with Cerebellar Ataxia Regardless of Auditory Feedback Availability
Quelle	In: Journal of Speech, Language, and Hearing Research, 64 (2021) 6, S.2234-2247 (14 Seiten) PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Parrell, Benjamin)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
Schlagwörter	Vowels; Neurological Impairments; Acoustics; Auditory Stimuli; Feedback (Response); Speech Communication; Adults; Visual Stimuli; Error Correction + Suchen Sie Ihr Suchwort? Neurodegenerative Erkrankung; Akustik; Auditive Stimulation; Korrektur
Abstract	Purpose: Individuals with cerebellar ataxia (CA) caused by cerebellar degeneration exhibit larger reactive compensatory responses to unexpected auditory feedback perturbations than neurobiologically typical speakers, suggesting they may rely more on feedback control during speech. We test this hypothesis by examining variability in unaltered speech. Previous studies of typical speakers have demonstrated a reduction in formant variability (centering) observed during the initial phase of vowel production from vowel onset to vowel midpoint. Centering is hypothesized to reflect feedback-based corrections for self-produced variability and thus may provide a behavioral assay of feedback control in unperturbed speech in the same manner as the compensatory response does for feedback perturbations. Method: To comprehensively compare centering in individuals with CA and controls, we examine centering in two vowels (/i/ and /[open-mid front unrounded vowel]/) under two contexts (isolated words and connected speech). As a control, we examine speech produced both with and without noise to mask auditory feedback. Results: Individuals with CA do not show increased centering compared to age-matched controls, regardless of vowel, context, or masking. Contrary to previous results in neurobiologically typical speakers, centering was not affected by the presence of masking noise in either group. Conclusions: The similar magnitude of centering seen with and without masking noise questions whether centering is driven by auditory feedback. However, if centering is at least partially driven by auditory/somatosensory feedback, these results indicate that the larger compensatory response to altered auditory feedback observed in individuals with CA may not reflect typical motor control processes during normal, unaltered speech production. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01