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Can we decode phonetic features in inner speech using surface electromyography?

Ladislas Nalborczyk1,2, Romain Grandchamp1, Ernst H W Koster2

  • 1Univ. Grenoble Alpes, CNRS, LPNC, Grenoble, France.

Plos One
|May 28, 2020
PubMed
Summary
This summary is machine-generated.

Inner speech production, or covert speech, may not involve significant speech muscle activity. Electromyography signals could not reliably distinguish phonetic content during inner speech, though some individual differences were noted.

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Area of Science:

  • Experimental Psychology
  • Neuroscience
  • Speech Motor Control

Background:

  • The link between inner speech (covert speech) and speech muscle activity remains a debated topic in experimental psychology.
  • Previous research has yielded conflicting evidence regarding the engagement of the speech motor system during inner speech.

Purpose of the Study:

  • To investigate the electromyographic correlates of inner speech production.
  • To determine if specific speech muscle activity accompanies covert speech.
  • To explore the potential for automatic classification of phonetic content during inner speech.

Main Methods:

  • A preregistered experiment was conducted using electromyography (EMG) to record speech muscle activity.
  • Participants produced nonwords with two distinct phonetic classes in both overt and inner speech conditions.
  • An automatic classification approach was applied to EMG signals to discriminate between articulatory features.

Main Results:

  • The automatic classification approach achieved reasonable accuracy for overt speech but failed to discriminate phonetic content during inner speech.
  • Surface electromyography signals did not reliably differentiate the phonetic content of covertly produced nonwords.
  • Exploratory analyses suggested potential for distinguishing between rounded and spread nonwords in covert speech for two participants.

Conclusions:

  • The study's findings suggest that overt speech is accompanied by distinct muscle activity, while inner speech may not be.
  • Current electromyography methods may not be sensitive enough to detect subtle speech motor engagement during inner speech.
  • Further research is needed to explore alternative methods for investigating the speech motor system's role in covert speech production.