Speech rate in Parkinson's disease: A controlled study

Area of Science:

• Neurology
• Speech-Language Pathology

Background:

• Speech disturbances are common in Parkinson's disease (PD) and impact patients throughout the disease progression.
• Understanding the origin and severity of these speech symptoms is crucial for clinical diagnosis and management.

Purpose of the Study:

• To characterize the clinical pattern of speech impairment in PD patients.
• To quantitatively assess differences in speech rate and articulation between PD patients and controls using automated analysis.

Main Methods:

• The study included 39 PD patients (in the 'on' medication state) and 45 age- and sex-matched healthy controls.
• Speech rate and articulation were measured during a reading task using an automated analytical method.
• PD patients with dyskinesias or motor fluctuations were excluded.

Main Results:

• PD patients demonstrated significantly reduced speech and articulation rates compared to controls.
• No significant correlations were found between speech parameters and L-dopa dosage, disease duration, age, or UPDRS III/Hoehn & Yahr scores.

Conclusions:

• Parkinson's disease is associated with a distinct pattern of reduced speech rate.
• Speech disfluencies in PD are likely a consequence of the underlying movement disorder affecting the motor control of speech production.