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Related Experiment Videos

Perception and action in hemispatial neglect

P Bartolomeo1, P D'Erme, R Perri

  • 1INSERM Unit 324, Centre Paul Broca, Paris, France. paolo@broca.inserm.fr

Neuropsychologia
|June 11, 1998
PubMed
Summary

Hemispatial neglect, a disorder affecting spatial bias after brain damage, is often due to attention deficits in visual perception. Motor response deficits are less common and may require additional impairments.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Hemispatial neglect is a neurological disorder characterized by a spatial bias contralateral to brain lesions.
  • Existing research suggests neglect arises from impairments at perceptual or motor stages.
  • This study investigates the role of defective arm movement programming in neglect behavior.

Purpose of the Study:

  • To explore the contribution of impaired arm movement programming to hemispatial neglect.
  • To differentiate between perceptual and motor deficits in patients with right brain damage (RBD).

Main Methods:

  • Two reaction time tasks (perceptual and motor) were administered to RBD patients with and without neglect, and control subjects.
  • The perceptual task involved lateralized stimuli with central motor responses.
  • The motor task used midline stimuli with hand responses directed to either hemispace.

Main Results:

  • Patients with neglect exhibited a rightward bias in the perceptual task.
  • Only two RBD patients without severe neglect showed significant slowing of leftward motor responses.
  • This suggests distinct reference frames for perception and arm movements.

Conclusions:

  • Hemispatial neglect typically stems from attentional impairments within a visual perceptual frame of reference.
  • Directional motor disorders in neglect may necessitate additional underlying deficits beyond attentional impairments.

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