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The disconnection apraxias.

Kenneth M Heilman1, Robert T Watson

  • 1Department of Neurology, University of Florida College of Medicine, Gainesville, FL, USA. heilman@neurology.ufl.edu

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|July 1, 2008
PubMed
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Limb apraxia, a deficit in skilled movements, arises from damage to brain modules storing movement information or disruptions in communication between these modules. Understanding these causes is key to defining apraxia forms.

Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Motor Control

Background:

  • Limb apraxia involves the inability to perform voluntary skilled movements, excluding sensorimotor deficits.
  • Effective object interaction relies on stored movement parameter information within cortical modules.
  • Skilled actions necessitate coordinated interactions among these specialized brain modules.

Purpose of the Study:

  • To define the various forms of limb apraxia.
  • To explore how apraxia results from module deterioration or inter-module disconnection.

Main Methods:

  • Review of existing literature on limb apraxia.
  • Analysis of theoretical models of sensorimotor integration.
  • Conceptual framework development for apraxia classification.

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Main Results:

  • Limb apraxia can stem from degraded neural representations of movement parameters within cortical modules.
  • Disconnections between these critical modules disrupt the coordinated execution of skilled movements.
  • Apraxia is conceptualized as a network disorder affecting an anatomically distributed system.

Conclusions:

  • Limb apraxia is characterized by impaired voluntary skilled movements due to neural degradation or disconnection.
  • The study categorizes apraxia based on underlying neural mechanisms: module deterioration or network disruption.
  • This framework aids in understanding the diverse clinical presentations of limb apraxia.