Apraxia: neural mechanisms and functional recovery

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Cognitive Motor Disorders

Background:

• Limb apraxia is a cognitive-motor disorder impacting learned, skilled upper limb movements.
• It is not caused by weakness, sensory loss, or lack of cooperation.
• Deficits involve spatial-temporal organization and sequencing of goal-directed actions.

Purpose of the Study:

• To provide an overview of limb apraxia for rehabilitation clinicians.
• To explain the two identified praxis systems: production and conceptual.
• To highlight the importance of understanding limb apraxia for patient education and treatment development.

Main Methods:

• The chapter discusses neural mechanisms and evaluation methods for apraxia.
• It categorizes apraxia into ideomotor and ideational types based on praxis system dysfunction.
• Information is presented within the framework of the production and conceptual praxis systems.

Main Results:

• Dysfunction of the production system leads to ideomotor apraxia (e.g., difficulty using tools).
• Dysfunction of the conceptual system results in ideational apraxia (e.g., difficulty with multi-step tasks).
• Limb apraxia is prevalent in stroke, Alzheimer disease, traumatic brain injury, and developmental disorders.

Conclusions:

• Limb apraxia significantly impacts activities of daily living, increasing healthcare costs and caregiver burden.
• Effective understanding of praxis systems is crucial for clinicians.
• Further research is needed to develop systematically studied treatments for limb apraxia.