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[Motor neglect]

H Torii1

  • 1Department of Neuropsychiatry, Kanazawa Medical University.

Rinsho Shinkeigaku = Clinical Neurology
|December 1, 1993
PubMed
Summary

Motor neglect involves underusing limbs without weakness, often reversible with encouragement. Associated signs include abnormal placing reactions and hypometria.

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Area of Science:

  • Neuroscience
  • Neurology
  • Clinical Psychology

Context:

  • Motor neglect is a distinct neurological condition characterized by the under-utilization of limbs on the side opposite to the brain lesion.
  • This condition occurs independently of motor weakness (hemiparesis), coordination problems (ataxia), or sensory deficits.

Purpose:

  • To delineate the core symptoms and associated signs of motor neglect.
  • To differentiate motor neglect from other forms of unilateral neglect and explore its underlying premotor factors.

Summary:

  • The core symptom of motor neglect is the under-utilization of contralesional limbs, which is notably reversible with examiner encouragement.
  • Frequently observed signs include abnormal placing reactions, lack of automatic withdrawal from painful stimuli, and hypometria (gesture completion deficits).
  • While tumors can cause transient motor neglect, recent research distinguishes premotor factors like directional hypokinesia, which are direction- and visual hemifield-specific, unlike motor neglect.

Impact:

  • This research clarifies the complex nature of unilateral neglect, distinguishing motor neglect from perceptual factors.
  • Understanding motor neglect's unique characteristics, such as its independence from cerebral dominance, aids in more accurate diagnosis and targeted therapeutic strategies.
  • The findings contribute to a deeper comprehension of sensorimotor integration and control in the brain.

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