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Related Experiment Video

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Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Adaptive phonemic coding in the listening and speaking brain.

Krystyna Grabski1, Marc Sato1

  • 1Aix-Marseille Université, CNRS, Laboratoire Parole & Langage, Aix-en-Provence, France.

Neuropsychologia
|November 27, 2019
PubMed
Summary

This study reveals shared brain regions for processing speech sounds (phonemic coding) during both listening and speaking. These findings suggest sensorimotor areas play a key role in how we understand and produce language.

Keywords:
Dorsal streamRepetition-suppressionSpeech perceptionSpeech productionfMRI adaptation

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Speech Processing

Background:

  • Phonemic coding is crucial for language comprehension and production.
  • Understanding the shared neural mechanisms underlying listening and speaking is essential for a complete model of language processing.

Purpose of the Study:

  • To identify the neural substrates involved in phonemic coding during both auditory perception and vocal production of vowels.
  • To investigate whether common brain regions are engaged during both listening and speaking of phonemes.

Main Methods:

  • Utilized a repetition suppression (RS) paradigm with functional magnetic resonance imaging (fMRI).
  • Measured blood-oxygen-level-dependent (BOLD) activity during repeated perception and production of vowels using sparse sampling techniques.

Main Results:

  • Observed common suppressed BOLD responses in shared brain areas for both vowel perception and production.
  • Identified key regions including inferior frontal gyri, posterior middle temporal gyrus, superior temporal sulcus, intraprietal sulcus, cingulate gyrus, and presupplementary motor area.

Conclusions:

  • Phonemic coding relies on common adaptive neural changes in premotor and associative sensory brain areas.
  • Suggests that shared sensorimotor regions contribute significantly to the neural basis of both listening and speaking.