Processing of Audiovisually Congruent and Incongruent Speech in School-Age Children with a History of Specific Language Impairment: A Behavioral and Event-Related Potentials Study

Autor/inn/en	Kaganovich, Natalya; Schumaker, Jennifer; Macias, Danielle; Gustafson, Dana
Titel	Processing of Audiovisually Congruent and Incongruent Speech in School-Age Children with a History of Specific Language Impairment: A Behavioral and Event-Related Potentials Study
Quelle	In: Developmental Science, 18 (2015) 5, S.751-770 (20 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1363-755X
DOI	10.1111/desc.12263
Schlagwörter	Language Impairments; Speech Impairments; Auditory Perception; Visual Perception; Children; Syllables; Discrimination Learning; Articulation Impairments; Brain; Cognitive Processes + Suchen Sie Ihr Suchwort? Speech disorder; Speech disorders; Speech disabilities; Speech disability; Speech handicap; Speech handicaps; Speech impairment; Speech impairments; Language handicaps; Sprachbehinderung; Language handicps; Language impairments; Auditive Wahrnehmung; Akustische Wahrnehmung; Akustik; Visuelle Wahrnehmung; Child; Kind; Kinder; Silbe; Lernen; Lernprozess; Artikulationsstörung; Gehirn; Cognitive process; Kognitiver Prozess
Abstract	Previous studies indicate that at least some aspects of audiovisual speech perception are impaired in children with specific language impairment (SLI). However, whether audiovisual processing difficulties are also present in older children with a history of this disorder is unknown. By combining electrophysiological and behavioral measures, we examined perception of both audiovisually congruent and audiovisually incongruent speech in school-age children with a history of SLI (H-SLI), their typically developing (TD) peers, and adults. In the first experiment, all participants watched videos of a talker articulating syllables "ba", "da", and "ga" under three conditions--audiovisual (AV), auditory only (A), and visual only (V). The amplitude of the N1 (but not of the P2) event-related component elicited in the AV condition was significantly reduced compared to the N1 amplitude measured from the sum of the A and V conditions in all groups of participants. Because N1 attenuation to AV speech is thought to index the degree to which facial movements predict the onset of the auditory signal, our findings suggest that this aspect of audiovisual speech perception is mature by mid-childhood and is normal in the H-SLI children. In the second experiment, participants watched videos of audivisually incongruent syllables created to elicit the so-called McGurk illusion (with an auditory "pa" dubbed onto a visual articulation of "ka", and the expectant perception being that of "ta" if audiovisual integration took place). As a group, H-SLI children were significantly more likely than either TD children or adults to hear the McGurk syllable as"pa" (in agreement with its auditory component) than as "ka" (in agreement with its visual component), suggesting that susceptibility to the McGurk illusion is reduced in at least some children with a history of SLI. Taken together, the results of the two experiments argue against global audiovisual integration impairment in children with a history of SLI and suggest that, when present, audiovisual integration difficulties in this population likely stem from a later (non-sensory) stage of processing. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01