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Updated: Oct 16, 2025

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Brain structures and cognitive abilities important for the self-monitoring of speech errors.

Ayan S Mandal1,2, Mackenzie E Fama1,3, Laura M Skipper-Kallal1

  • 1Georgetown University Medical Center, Center for Brain Plasticity and Recovery and Department of Neurology.

Neurobiology of Language (Cambridge, Mass.)
|October 22, 2021
PubMed
Summary

Successful speech error monitoring involves distinct cognitive functions. Damage to frontal white matter and dorsolateral prefrontal cortex (DLPFC) impairs detecting phonological errors in individuals with aphasia.

Keywords:
aphasiadorsolateral prefrontal cortexexecutive functionfrontal white matterspeech error detectionspeech fluencyvoxel-based lesion symptom mapping

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Speech-Language Pathology

Background:

  • Self-monitoring of speech errors is crucial for fluent communication.
  • The neural underpinnings and cognitive correlates of speech error detection are not fully understood.
  • Individuals with post-stroke aphasia provide a unique model to study speech error monitoring deficits.

Purpose of the Study:

  • To investigate the neural and behavioral factors influencing phonological and semantic speech error detection in aphasia.
  • To identify brain regions critical for self-monitoring of speech errors using lesion mapping.
  • To refine models of speech production and self-correction.

Main Methods:

  • Correlational analyses examined relationships between error detection and cognitive abilities (naming, fluency, comprehension, executive function).
  • Multivariate lesion-symptom mapping (VLSM) identified brain lesion locations associated with impaired error detection.
  • Phonological and semantic error detection accuracy was assessed in individuals with post-stroke aphasia.

Main Results:

  • Speech fluency and executive function independently predicted phonological error detection.
  • Word-level auditory comprehension was associated with semantic error detection.
  • Damage to frontal white matter, including the dorsolateral prefrontal cortex (DLPFC), causally linked to reduced overall and phonological error detection.

Conclusions:

  • Speech error monitoring is not a unitary function; different error types depend on distinct cognitive processes.
  • Frontal white matter tracts and the DLPFC are critical for self-monitoring of speech, particularly phonological errors.
  • Findings inform neurobiological models of speech production and error correction in aphasia.