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Left hemispheric specialization for learned, skilled, and purposeful action

H Poizner1, A S Merians, M A Clark

  • 1Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, New Jersey 07102, USA. poizner@signer.rutgers.edu

Neuropsychology
|April 29, 1998
PubMed
Summary
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Participants with limb apraxia due to left-hemisphere damage showed impaired movement planning. Right-hemisphere damage also affected wrist motion control, possibly due to spatial neglect.

Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Limb apraxia is a disorder of skilled motor planning often associated with left-hemisphere lesions.
  • Right-hemisphere lesions can cause spatial deficits like hemispatial neglect, potentially impacting motor control.
  • Understanding the distinct motor control deficits following unilateral brain lesions is crucial for rehabilitation.

Purpose of the Study:

  • To investigate the effects of left-hemisphere lesions with limb apraxia and right-hemisphere lesions on 3D wrist motion during repetitive slicing gestures.
  • To differentiate the motor control impairments associated with apraxia versus spatial neglect.

Main Methods:

  • Three-dimensional motion analysis was used to capture wrist trajectories during repetitive slicing tasks.

Related Experiment Videos

  • Participants included individuals with left-hemisphere lesions and limb apraxia, right-hemisphere lesions, and neurologically intact controls.

    • Main Results:

    • Participants with left-hemisphere lesions and apraxia exhibited impaired spatial-temporal coupling and interjoint coordination.
    • Both lesioned groups showed deviations in the 3D plane of wrist motion compared to controls.
    • Right-hemisphere lesioned participants' deficits may relate to left hemispatial neglect, while apraxic participants' deficits suggest a movement planning issue.

    Conclusions:

    • Limb apraxia is characterized by deficits in movement planning, affecting trajectory control and coordination.
    • Right-hemisphere lesions can impair control of the movement plane, potentially linked to spatial neglect.
    • Distinct neural substrates underlie apraxic and spatial neglect-related motor control deficits.