Speech Motor Programming in Apraxia of Speech: Evidence from a Delayed Picture-Word Interference Task

Autor/inn/en	Mailend, Marja-Liisa; Maas, Edwin
Titel	Speech Motor Programming in Apraxia of Speech: Evidence from a Delayed Picture-Word Interference Task
Quelle	In: American Journal of Speech-Language Pathology, 22 (2013) 2, (17 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1058-0360
DOI	10.1044/1058-0360(2013/12-0101)
Schlagwörter	Neurological Impairments; Speech Impairments; Adults; Naming; Interference (Learning); Reaction Time; Hypothesis Testing + Suchen Sie Ihr Suchwort? Neurodegenerative Erkrankung; Speech impairment; Speech handicap; Speech handicaps; Language handicps; Language impairments; Sprachbehinderung; Reaktionsvermögen; Hypothesenprüfung; Hypothesentest
Abstract	Purpose: Apraxia of speech (AOS) is considered a speech motor programming impairment, but the specific nature of the impairment remains a matter of debate. This study investigated 2 hypotheses about the underlying impairment in AOS framed within the Directions Into Velocities of Articulators (DIVA; Guenther, Ghosh, & Tourville, 2006) model: The retrieval hypothesis states that access to the motor programs is impaired, and the damaged programs hypothesis states that the motor programs themselves are damaged. Method: The experiment used a delayed picture-word interference paradigm in which participants prepare their response and auditory distracters are presented with the go signal. The overlap between target and distracter words was manipulated (i.e., shared sounds or no shared sounds), and participants' reaction times (RTs) were measured. Participants included 5 speakers with AOS (4 with concomitant aphasia), 2 speakers with aphasia without AOS, and 9 age-matched control speakers. Results: The control speakers showed no effects of distracter type or presence. The speakers with AOS had longer RTs in the distracter condition compared to the no-distracter condition. The speakers with aphasia without AOS were comparable to the control group in their overall RTs and RT pattern. Conclusion: Results provide preliminary support for the retrieval hypothesis, suggesting that access to motor programs may be impaired in speakers with AOS. However, the possibility that the motor programs may also be damaged cannot be ruled out. (Contains 4 tables, 3 figures and 5 footnotes.) (As Provided).
Anmerkungen	American Speech-Language-Hearing Association (ASHA). 10801 Rockville Pike, Rockville, MD 20852. Tel: 800-638-8255; Fax: 301-571-0457; e-mail: subscribe@asha.org; Web site: http://ajslp.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10