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Using Practice Testing, Public Speaking, and Source Monitoring to Examine the Influences of Learning Strategies and Stress on Episodic Memory
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Speech preparation in adults with persistent developmental stuttering.

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  • 1Department of Psychology, Tulane University, United States.

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Men who stutter show altered auditory processing during speech preparation due to differences in motor efference copy. This suggests atypical cortical mechanisms contribute to speech planning difficulties in stuttering.

Keywords:
Auditory event-related potentialsMotor efference copySpeech preparationStuttering

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Area of Science:

  • Neuroscience
  • Speech and Hearing Sciences
  • Cognitive Psychology

Background:

  • Motor efference copy is a neural signal transmitting movement intent to sensory areas.
  • This signal is crucial for predicting sensory consequences of motor commands, including speech.
  • Previous research suggests potential differences in speech processing in adults who stutter (MWS).

Purpose of the Study:

  • To investigate if speech preparation modulates auditory processing differently in MWS compared to fluent adults.
  • To examine the role of motor efference copy in speech planning deficits observed in MWS.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in MWS and fluent adults.
  • A cue-target paradigm with speech preparation and control conditions was employed.
  • Acoustic stimuli were presented to probe auditory responsiveness during speech planning.

Main Results:

  • MWS exhibited prolonged vocal reaction times, indicating challenges in rapidly updating speech plans.
  • A reduced negative slow wave, indexing motor efference copy, was observed in MWS.
  • MWS showed diminished left prefrontal and delayed auditory responses, correlated with stuttering severity.

Conclusions:

  • Findings suggest atypical cortical mechanisms, including altered motor efference copy, underlie speech planning difficulties in MWS.
  • These neural differences provide insights into the pathophysiology of stuttering.
  • The study highlights the interplay between motor planning and auditory processing in fluent and disfluent speech.