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Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception

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Predictive Coding and Internal Error Correction in Speech Production.

Alex Teghipco¹, Kayoko Okada², Emma Murphy²

¹Department of Cognitive Sciences, University of California, Irvine, CA, USA.

Neurobiology of Language (Cambridge, Mass.)

|May 25, 2023

Summary

This summary is machine-generated.

This study found that the left posterior middle temporal gyrus (pMTG) shows increased activity when potential speech errors involve taboo words, suggesting its role in internal error correction during speech production.

Keywords:

fMRI imagined speech internal error correction internal models nonwords overt speech predictive coding speech production taboo words tongue twisters

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Area of Science:

Neuroscience
Cognitive Science
Psycholinguistics

Background:

Speech production is complex, with errors being rare.
Previous studies suggested left posterior middle temporal gyrus (pMTG) involvement in internal error correction.
Forward predictive signals in auditory cortex during speech production were previously identified.

Purpose of the Study:

To replicate forward prediction and lexicality effects in speech error detection.
To investigate neural evidence for internal error correction using taboo words.
To further elucidate the role of left pMTG in speech error monitoring.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used.
A tongue twister paradigm was employed to induce potential speech errors.
Stimuli were designed to bias potential errors toward nonwords, words, and taboo words.

Main Results:

The forward prediction effect in auditory cortex was replicated.
Left pMTG showed a significantly greater response when potential errors were biased toward taboo words compared to neutral words.
No significant difference in brain response was found based on the lexical status (word vs. nonword) of potential errors.

Conclusions:

Left pMTG is implicated in internal error correction during speech production, particularly when potential errors involve taboo words.
The findings support the role of left pMTG in monitoring and correcting speech errors before they occur.
This study advances our understanding of the neural mechanisms underlying speech fluency and error processing.