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Type:	Artigo de Periódico
Title:	N1 response attenuation and the mismatch negativity (mmn) to within- and across-category phonetic contrasts
Other Titles:	N1 response attenuation and the mismatch negativity (mmn) to within- and across-category phonetic contrasts
Authors:	Daniel Márcio Rodrigues Silva Danilo B. Melges Rui Rothe-Neves
Abstract:	According to the neural adaptation model of the mismatch negativity (MMN), the sensitivity of this event-related response to both acoustic and categorical information in speech sounds can be accounted for by assuming that (a) the degree of overlapping between neural representations of two sounds depends on both the acoustic difference between them and whether or not they belong to distinct phonetic categories, and (b) a release from stimulus-specific adaptation causes an enhanced N1 obligatory response to infrequent deviant stimuli. On the basis of this view, we tested in Experiment 1 whether the N1 response to the second sound of a pair (S2) would be more attenuated in pairs of identical vowels compared with pairs of different vowels, and in pairs of exemplars of the same vowel category compared with pairs of exemplars of different categories. The psychoacoustic distance between S1 and S2 was the same for all within-category and across-category pairs. While N1 amplitudes decreased markedly from S1 to S2, responses to S2 were quite similar across pair types, indicating that the attenuation effect in such conditions is not stimulus specific. In Experiment 2, a pronounced MMN was elicited by a deviant vowel sound in an across-category oddball sequence, but not when the exact same deviant vowel was presented in a within-category oddball sequence. This adds evidence that MMN reflects categorical phonetic processing. Taken together, the results suggest that different neural processes underlie the attenuation of the N1 response to S2 and the MMN to vowels.
Subject:	Categorização (Linguística) Circuitos neurais Percepção da fala
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ENG - DEPARTAMENTO DE ENGENHARIA ELÉTRICA FALE - FACULDADE DE LETRAS
Rights:	Acesso Restrito
metadata.dc.identifier.doi:	https://doi.org/10.1111/psyp.12824
URI:	http://hdl.handle.net/1843/60830
Issue Date:	24-Mar-2017
metadata.dc.relation.ispartof:	Psychophysiology
Appears in Collections:	Artigo de Periódico

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