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Speech motor programming in hypokinetic and ataxic dysarthria.
Kristie A Spencer1, Margaret A Rogers
1Department of Speech and Hearing Sciences, University of Washington, Seattle, WA 98105-6246, USA. kas@u.washington.edu
Brain and Language
|August 16, 2005
Summary
This study investigated speech programming in individuals with ataxic and hypokinetic dysarthria. Findings suggest distinct processing deficits, separate from motor execution, impacting speech preparation in these conditions.
Area of Science:
- Neuroscience
- Speech-Language Pathology
- Motor Control
Background:
- Cerebellar and basal ganglia circuits are crucial for motor programming.
- Cerebellar disease impairs advance movement sequencing; Parkinson's disease affects response maintenance and switching.
- Speech programming deficits in ataxic and hypokinetic dysarthria remain understudied.
Purpose of the Study:
- To examine motor programming deficits in speech production for individuals with ataxic and hypokinetic dysarthria.
- To determine if speech programming impairments are separable from motor execution deficits in these populations.
Main Methods:
- Speech reaction time protocols were administered to control participants and adults with ataxic and hypokinetic dysarthria.
- The protocols were designed to assess the ability to program and prepare utterances in advance of speech onset.
Main Results:
- Individuals with ataxic and hypokinetic dysarthria demonstrated impaired speech programming.
- These processing deficits appear distinct from underlying motor execution impairments.
- Results provide initial evidence for separable processing disruptions in speech preparation.
Conclusions:
- Ataxic and hypokinetic dysarthria may involve specific deficits in the programming of speech utterances.
- These findings highlight the importance of considering cognitive-motor programming in speech disorders.
- Further research is warranted to elucidate the neural underpinnings of these speech programming deficits.