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This study quantitatively analyzes speech errors in primary progressive apraxia of speech (PPAOS) subtypes. Findings show distinct error patterns correlating with PPAOS subtypes, aiding diagnosis and prognosis.

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Area of Science:

  • Neurology
  • Speech-Language Pathology
  • Neurodegenerative Diseases

Background:

  • Primary progressive apraxia of speech (PPAOS) is a neurodegenerative disorder affecting speech motor planning.
  • PPAOS presents with distinct subtypes: phonetic, prosodic, and mixed, each with unique clinical features and progression.
  • Previous subtype classification relied on clinical impression, necessitating objective, quantitative methods.

Purpose of the Study:

  • To quantitatively determine the distribution of speech error types across PPAOS subtypes using a word repetition task.
  • To investigate the impact of word complexity on speech error types and frequency in different PPAOS subtypes.

Main Methods:

  • Forty-five patients with PPAOS (phonetic, prosodic, mixed) and 45 controls repeated words of varying phonetic complexity.
  • Speech errors, including phonetic (additions, deletions, substitutions/distortions) and prosodic (segmentations), were systematically analyzed.

Main Results:

  • All PPAOS groups exhibited significantly more errors than controls, with comparable total error counts across subtypes.
  • The phonetic PPAOS group showed more phonetic errors, while the prosodic PPAOS group produced more segmentations.
  • Increased word complexity led to more errors in PPAOS patients, with phonetic and prosodic groups showing subtype-specific error increases.

Conclusions:

  • Quantitative analysis of speech errors in a word repetition task supports the classification of PPAOS subtypes.
  • These findings can enhance differential diagnosis accuracy and prognosis for PPAOS patients.
  • Objective speech error data may reveal distinct disease trajectories among PPAOS subtypes.