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Patients with motor speech disorders (MSDs) show varying abilities to modulate speech rate, impacting articulatory accuracy. This may aid in differentiating between MSD subtypes and healthy speech.

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Area of Science:

  • Speech-Language Pathology
  • Neurolinguistics
  • Motor Speech Disorders

Background:

  • Motor speech disorders (MSDs) encompass a range of conditions affecting the motor planning, programming, and execution of speech.
  • Understanding speech modulation capabilities is crucial for accurate diagnosis and treatment of MSDs.

Purpose of the Study:

  • To compare speech rate modulation abilities in patients with different types of motor speech disorders.
  • To investigate the impact of stimuli complexity on speech rate modulation.
  • To assess the relationship between speech modulation and articulatory accuracy in MSDs.

Main Methods:

  • Twenty-nine patients with apraxia of speech (AOS) or dysarthria, and nine controls, performed speech tasks at natural, fast, and slow rates.
  • Speech rate was manipulated using varying complexity stimuli (words, sentences).
  • Word durations, interword intervals, and articulatory accuracy were measured and analyzed using linear mixed-effects models.

Main Results:

  • Patients with prosodic AOS exhibited reduced capacity to increase speech rate and increased articulatory errors.
  • Spastic dysarthria patients showed some rate modulation capacity, particularly in sentence repetition.
  • Apraxia of speech patients generally made more articulatory errors, which decreased with slower speech rates.

Conclusions:

  • Speech rate modulation capacity and its effect on articulatory accuracy can help differentiate between healthy speech and various MSD subtypes.
  • Further validation in larger, diverse cohorts is needed to confirm these findings.