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Related Experiment Videos

Praxis and the right hemisphere

S Z Rapcsak1, C Ochipa, P M Beeson

  • 1Neurology Service, VA Medical Center, Tucson, Arizona 85723.

Brain and Cognition
|November 1, 1993
PubMed
Summary
This summary is machine-generated.

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Following a left hemisphere stroke, the right hemisphere controls familiar actions but needs the left for novel or abstract movements. This impacts understanding praxis and apraxia recovery.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Investigating the cerebral control of praxis.
  • Examining hemispheric specialization in motor control and learning.
  • Understanding the impact of unilateral brain damage on skilled movements.

Observation:

  • A right-handed patient with complete left cerebral hemisphere destruction due to stroke was studied.
  • Impairments were noted in pantomiming transitive gestures and reproducing novel movement sequences with the left hand.
  • Overlearned habitual actions, intransitive gestures, axial commands, and gesture recognition were relatively preserved.

Findings:

  • The right hemisphere praxis system favors concrete, context-dependent execution of familiar action routines.

Related Experiment Videos

  • The right hemisphere relies on left hemisphere input for abstract, context-independent transitive movements and novel sequence learning.
  • Gesture recognition and discrimination appear to be preserved in the right hemisphere.

    • Implications:

    • Suggests a strong right-hemisphere bias for concrete praxis, dependent on left-hemisphere support for abstract praxis.
    • Offers insights into potential recovery mechanisms for apraxia after stroke.
    • Highlights the critical role of interhemispheric communication in complex motor control.