Feedforward and Feedback Control in Apraxia of Speech: Effects of Noise Masking on Vowel Production

Autor/inn/en	Maas, Edwin; Mailend, Marja-Liisa; Guenther, Frank H.
Titel	Feedforward and Feedback Control in Apraxia of Speech: Effects of Noise Masking on Vowel Production
Quelle	In: Journal of Speech, Language, and Hearing Research, 58 (2015) 2, S.185-200 (16 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
DOI	10.1044/2014_JSLHR-S-13-0300
Schlagwörter	Speech Impairments; Articulation (Speech); Hypothesis Testing; Feedback (Response); Auditory Stimuli; Aphasia; Acoustics; Vowels; Age Differences; Comparative Analysis; Neurological Impairments + Suchen Sie Ihr Suchwort? Speech impairment; Speech handicap; Speech handicaps; Language handicps; Language impairments; Sprachbehinderung; Hypothesenprüfung; Hypothesentest; Auditive Stimulation; Expressive Aphasie; Aphasie; Akustik; Age; Difference; Age difference; Altersunterschied; Neurodegenerative Erkrankung
Abstract	Purpose: This study was designed to test two hypotheses about apraxia of speech (AOS) derived from the Directions Into Velocities of Articulators (DIVA) model (Guenther et al., 2006): the feedforward system deficit hypothesis and the feedback system deficit hypothesis. Method: The authors used noise masking to minimize auditory feedback during speech. Six speakers with AOS and aphasia, 4 with aphasia without AOS, and 2 groups of speakers without impairment (younger and older adults) participated. Acoustic measures of vowel contrast, variability, and duration were analyzed. Results: Younger, but not older, speakers without impairment showed significantly reduced vowel contrast with noise masking. Relative to older controls, the AOS group showed longer vowel durations overall (regardless of masking condition) and a greater reduction in vowel contrast under masking conditions. There were no significant differences in variability. Three of the 6 speakers with AOS demonstrated the group pattern. Speakers with aphasia without AOS did not differ from controls in contrast, duration, or variability. Conclusion: The greater reduction in vowel contrast with masking noise for the AOS group is consistent with the feedforward system deficit hypothesis but not with the feedback system deficit hypothesis; however, effects were small and not present in all individual speakers with AOS. Theoretical implications and alternative interpretations of these findings are discussed. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01