Spatiotemporal Dynamics of Speech Sound Perception in Chronic Developmental Stuttering

Autor/inn/en	Liotti, Mario; Ingham, Janis C.; Takai, Osamu; Paskos, Delia Kothmann; Perez, Ricardo; Ingham, Roger J.
Titel	Spatiotemporal Dynamics of Speech Sound Perception in Chronic Developmental Stuttering
Quelle	In: Brain and Language, 115 (2010) 2, S.141-147 (7 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0093-934X
DOI	10.1016/j.bandl.2010.07.007
Schlagwörter	Brain Hemisphere Functions; Stuttering; Vowels; Auditory Perception; Control Groups; Volunteers; Diagnostic Tests; Correlation; Motor Reactions; Psychomotor Skills; Language Processing; Speech; Phonology + Suchen Sie Ihr Suchwort? Stammer; Stottern; Auditive Wahrnehmung; Akustische Wahrnehmung; Akustik; Freiwilliger; Diagnostic test; Diagnostischer Test; Korrelation; Psychomotorische Aktivität; Sprachverarbeitung; Speaking; Sprechen; Fonologie
Abstract	High-density ERPs were recorded in eight adults with persistent developmental stuttering (PERS) and eight matched normally fluent (CONT) control volunteers while participants either repeatedly uttered the vowel "ah" or listened to their own previously recorded vocalizations. The fronto-central N1 auditory wave was reduced in response to spoken vowels relative to heard vowels (auditory-vocal gating), but no difference in the extent of such modulation was found in the PERS group. Abnormalities in the PERS group were restricted to the LISTEN condition, in the form of early N1 and late N3 amplitude changes. Voltage of the N1 wave was significantly reduced over right inferior temporo-occipital scalp in the PERS group. A laterality index derived from N1 voltage moderately correlated with the PERS group's assessed pre-experiment stuttering frequency. Source localization with sLORETA (Pascual-Marqui, R. D. (2002). "Standardized low-resolution brain electromagnetic tomography (sLORETA): Technical details." "Methods & Findings in Experimental & Clinical Pharmacology, 24," 5-12.) revealed that at the peak of the N1 the PERS group displayed significantly greater current density in right primary motor cortex than the CONT group, suggesting abnormal early speech-motor activation. Finally, the late N3 wave was reduced in amplitude over inferior temporo-occipital scalp, more so over the right hemisphere. sLORETA revealed that in the time window of the N3 the PERS group showed significantly less current density in right secondary auditory cortex than the CONT group, suggesting abnormal speech sound perception. These results point to a deficit in auditory processing of speech sounds in persistent developmental stuttering, stemming from early increased activation of right rolandic area and late reduced activation in right auditory cortex. (Contains 1 figure.) (As Provided).
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Update	2017/4/10