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[Automatic-voluntary dissociation in apraxia]

¹Department of Neuropsychiatry, Ehime University School of Medicine.

Rinsho Shinkeigaku = Clinical Neurology

|May 13, 1998

Summary

This summary is machine-generated.

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Automatic-voluntary dissociation in apraxia occurs in skilled movements, not in tasks without procedural memory. This dissociation is explained by distinct implicit and explicit motor systems.

Area of Science:

Neuroscience
Cognitive Psychology
Motor Control

Context:

Apraxia is a motor disorder affecting skilled movements.
Automatic-voluntary dissociation describes differing performance in automatic versus voluntary execution of praxis.
Procedural memory underpins learned, skilled motor acts.

Purpose:

To explore the phenomenon of automatic-voluntary dissociation in apraxia.
To differentiate praxis with and without procedural memory.
To propose a neurobiological framework for understanding this dissociation.

Summary:

Automatic-voluntary dissociation in apraxia is observed in praxis reliant on procedural memory (e.g., dressing) but not in praxis without it (e.g., constructional tasks).
This dissociation can be conceptualized through dual motor systems: an implicit system (medial premotor cortex) for involuntary procedural memory and an explicit system (dorsolateral premotor cortex) for voluntary procedural memory.

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Impact:

Provides a framework for understanding apraxia subtypes.
Suggests distinct neural pathways for implicit and explicit motor control.
Informs potential therapeutic targets for motor rehabilitation.