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Evidence for a Causal Dissociation of the McGurk Effect and Congruent Audiovisual Speech Perception via TMS to the Left pSTS.
Ahn, EunSeon; Majumdar, Areti; Lee, Taraz G; Brang, David.
Afiliación
  • Ahn E; Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.
  • Majumdar A; Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.
  • Lee TG; Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.
  • Brang D; Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.
Multisens Res ; 37(4-5): 341-363, 2024 Aug 16.
Article en En | MEDLINE | ID: mdl-39191410
ABSTRACT
Congruent visual speech improves speech perception accuracy, particularly in noisy environments. Conversely, mismatched visual speech can alter what is heard, leading to an illusory percept that differs from the auditory and visual components, known as the McGurk effect. While prior transcranial magnetic stimulation (TMS) and neuroimaging studies have identified the left posterior superior temporal sulcus (pSTS) as a causal region involved in the generation of the McGurk effect, it remains unclear whether this region is critical only for this illusion or also for the more general benefits of congruent visual speech (e.g., increased accuracy and faster reaction times). Indeed, recent correlative research suggests that the benefits of congruent visual speech and the McGurk effect rely on largely independent mechanisms. To better understand how these different features of audiovisual integration are causally generated by the left pSTS, we used single-pulse TMS to temporarily disrupt processing within this region while subjects were presented with either congruent or incongruent (McGurk) audiovisual combinations. Consistent with past research, we observed that TMS to the left pSTS reduced the strength of the McGurk effect. Importantly, however, left pSTS stimulation had no effect on the positive benefits of congruent audiovisual speech (increased accuracy and faster reaction times), demonstrating a causal dissociation between the two processes. Our results are consistent with models proposing that the pSTS is but one of multiple critical areas supporting audiovisual speech interactions. Moreover, these data add to a growing body of evidence suggesting that the McGurk effect is an imperfect surrogate measure for more general and ecologically valid audiovisual speech behaviors.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Percepción del Habla / Lóbulo Temporal / Percepción Visual / Estimulación Magnética Transcraneal Límite: Adult / Female / Humans / Male Idioma: En Revista: Multisens Res Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Percepción del Habla / Lóbulo Temporal / Percepción Visual / Estimulación Magnética Transcraneal Límite: Adult / Female / Humans / Male Idioma: En Revista: Multisens Res Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos