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Brain networks involved in accented speech processing.

Mireia Hernández1, Noelia Ventura-Campos2, Albert Costa3

  • 1Section of Cognitive Processes, Department of Cognition, Development, and Educational Psychology, Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain; Cognition and Brain Plasticity Group, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona, Spain.

Brain and Language
|April 9, 2019
PubMed
Summary
This summary is machine-generated.

Processing accented speech involves brain networks for prosody, executive control, and salience. The reward network showed a preference for the native accent, suggesting social belonging influences speech perception.

Keywords:
Accented speechBrain networksICARegional accentSpeech perceptionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • Accented speech processing (ASP) research has been limited by intelligibility issues.
  • Previous studies often focused on isolated brain regions rather than networks.

Purpose of the Study:

  • To investigate the neural correlates of accented speech processing using fMRI.
  • To identify brain networks involved in processing speech with regional accents.
  • To explore the influence of accent familiarity on neural responses.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Independent component analysis (ICA) was used to identify brain networks.
  • Two regional Spanish accents (Latin American and Castilian) with differing prosody but similar phonetics were used to maintain intelligibility.

Main Results:

  • Accented speech processing engaged a network including the cerebellum, putamen, and thalamus, crucial for prosody.
  • Anterior fronto-temporal areas and the inferior frontal gyrus, involved in lexical-semantic and executive functions, were also recruited.
  • Domain-general networks (dorsal attentional, default mode, salience) supported cognitive demands and salient event processing.
  • The reward network exhibited a preference for the native accent, indicating a link to social belonging.

Conclusions:

  • Accented speech processing relies on integrated brain networks rather than isolated regions.
  • Cognitive control and salience detection networks play a significant role in managing accented speech.
  • Neural responses to accents are influenced by social factors, such as a sense of belonging to a native group.