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Praxis performance with left versus right hemisphere lesions.

L M Maher1, L J Rothi2, K M Heilman3

  • 1Department of Educational Psychology and Special Education, Georgia State University, University Plaza, Atlanta, GA 30303, USA.

Neurorehabilitation
|February 15, 2014
PubMed
Summary
This summary is machine-generated.

This study investigated the role of the right hemisphere in praxis. Findings indicate that left hemisphere lesions cause ideomotor apraxia, while right hemisphere lesions do not significantly impair skilled limb movement.

Keywords:
ApraxiaPraxisRight hemisphereSkilled movements

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Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Motor Control

Background:

  • Praxis, defined as skilled, purposive limb movement, is typically associated with left cerebral hemisphere function.
  • Recent research suggests a potential role for the right hemisphere in mediating praxis, challenging established understanding.

Purpose of the Study:

  • To investigate the role of the right cerebral hemisphere in mediating praxis.
  • To compare praxis performance in patients with left or right hemisphere lesions against healthy controls.

Main Methods:

  • Studied right-handed patients with unilateral cerebral hemisphere lesions (left or right) and matched right-handed normal controls.
  • Assessed transitive gesture performance of the forelimb ipsilateral to the lesion in patients.
  • Scored left and right hand performances separately in controls for statistical comparison.
  • Evaluated six dimensions of gesture performance and an overall apraxia score.

Main Results:

  • Patients with left hemisphere lesions (LHD) demonstrated deficient praxis, consistent with ideomotor apraxia.
  • Patients with right hemisphere lesions (RHD) did not show significant deficits in praxis performance compared to controls.
  • No crucial role for the right hemisphere in mediating praxis was identified in this study.

Conclusions:

  • The findings support the traditional view that the left cerebral hemisphere is crucial for praxis.
  • The right hemisphere does not appear to play a critical role in the execution of skilled, purposive limb movements.