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Related Experiment Videos

Neglect

R D Rafal1

  • 1Department of Neurology, University of California (Davis), Martinez 94553.

Current Opinion in Neurobiology
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

Neglect is a visual attention disorder where patients ignore stimuli in the contralesional field. Research suggests perception is intact, but selection for action and awareness are impaired.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Neglect is a disorder of orienting, characterized by unawareness of the contralesional visual field.
  • Pre-attentive visual processing, including scene parsing and object grouping, remains intact in neglect patients.
  • This suggests intact perception up to semantic classification, with neglect affecting action selection and awareness access.

Purpose of the Study:

  • To elucidate the mechanisms underlying visual neglect.
  • To differentiate between perceptual processing and attentional selection deficits in neglect.
  • To explore the neural substrates contributing to neglect symptoms.

Main Methods:

  • Review of recent studies on neglect mechanisms.
  • Analysis of patient data to assess pre-attentive vs. attentive processing.

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  • Investigation into neural correlates of attention, spatial representation, and oculomotor control.

    • Main Results:

    • Neglect impairs selection for action and access to awareness, not basic perceptual parsing.
    • Contributing mechanisms include ipsilesional orienting bias, altered spatial representation, and attention disengagement deficits.
    • Neural substrates for these mechanisms are increasingly being identified.

    Conclusions:

    • Visual neglect primarily impacts attentional selection and awareness, rather than early perceptual processing.
    • Multiple mechanisms, including attentional biases and representational deficits, underlie neglect.
    • Ongoing research is identifying the specific neural circuits involved in these mechanisms.