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Related Experiment Videos

Praxis lateralization: errors in right and left hemisphere stroke.

B Hanna-Pladdy1, S K Daniels, M A Fieselman

  • 1Department of Psychiatry and Neurology, Tulane University School of Medicine, New Orleans, USA. pladdybh@neurology.ufl.edu

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 8, 2001
PubMed
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Praxis performance with left versus right hemisphere lesions.

NeuroRehabilitation·2014

The left hemisphere stores skilled movement details, while the right hemisphere contributes to action planning, particularly for spatial and timing aspects of transitive gestures. This suggests some action program components may be processed by both brain hemispheres.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • Most right-handers store skilled movement representations in the left hemisphere.
  • The right hemisphere's role in action planning is not fully understood.
  • Investigating hemisphere-specific contributions to motor control is crucial for understanding brain function.

Purpose of the Study:

  • To determine if specific components of action programs are processed by the right hemisphere or represented bilaterally.
  • To investigate error patterns in individuals with left (LHD) and right hemisphere damage (RHD) compared to controls (C).
  • To elucidate the distinct roles of each cerebral hemisphere in the execution of skilled movements.

Main Methods:

  • Subjects with LHD, RHD, and control subjects performed gestures to verbal command using their ipsilesional limb.

Related Experiment Videos

  • Error patterns were analyzed for qualitative, spatiotemporal, conceptual, and apraxic errors.
  • Gestures included both transitive (tool use) and intransitive (no tool use) actions.

    • Main Results:

    • The LHD group exhibited significantly more qualitative errors than control and RHD groups.
    • RHD subjects produced specific apraxic errors, particularly spatial and temporal ones, during transitive gestures.
    • LHD subjects showed a broader range of spatiotemporal and conceptual errors for both gesture types.

    Conclusions:

    • The left hemisphere appears to store spatiotemporal and conceptual representations of learned skilled movements.
    • Specific action program components, such as external configuration and timing, may involve bihemispheric representation.
    • These findings highlight a complementary role of both hemispheres in complex motor planning and execution.