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Frontal lobe neglect in monkeys

K M Heilman1, E Valenstein, A Day

  • 1Department of Neurology, University of Florida College of Medicine, Gainesville, USA.

Neurology
|June 1, 1995
PubMed
Summary
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Monkeys with frontal lesions show motor neglect, not sensory neglect. A new task revealed ipsilateral arm errors, termed "allokinesia," suggesting a disinhibition defect.

Area of Science:

  • Neuroscience
  • Primate Behavior

Background:

  • Unilateral frontal lesions in primates can induce neglect.
  • Previous tasks suggested motor rather than sensory neglect, but might not detect subtle sensory deficits.

Purpose of the Study:

  • To investigate sensory neglect after frontal lesions using a perceptually complex task.
  • To characterize motor deficits and unusual ipsilateral arm responses.

Main Methods:

  • Two monkeys underwent unilateral frontal (arcuate gyrus) ablation.
  • A perceptually complex crossed-response task was employed to assess sensory and motor neglect.
  • Behavioral responses and errors were meticulously recorded.

Main Results:

  • No contralateral perceptual disorders or sensory neglect were observed.

Related Experiment Videos

  • Both monkeys exhibited contralateral arm motor neglect.
  • Increased incorrect responses with the ipsilateral arm were noted, termed 'allokinesia'.

    • Conclusions:

    • Frontal lesions primarily cause motor neglect, not sensory neglect, in this task.
    • The ipsilateral arm errors ('allokinesia') represent a disinhibition defect, not a compensatory strategy.
    • This finding refines our understanding of neglect after arcuate gyrus lesions.