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Reaching between obstacles in spatial neglect and visual extinction.

A David Milner1, Robert D McIntosh

  • 1Cognitive Neuroscience Research Unit, Wolfson Research Institute, University of Durham, Queen's Campus, University Boulevard, Stockton-on-Tees TS17 6BH, UK. a.d.milner@durham.ac.uk

Progress in Brain Research
|December 4, 2003
PubMed
Summary
This summary is machine-generated.

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Patients with neglect syndrome can still guide actions around obstacles, even when neglecting visual information. This suggests separate brain pathways for perception and visually guided action.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • The neglect syndrome is characterized by a deficit in awareness of one side of space.
  • It remains unclear whether perception and visually guided action are dissociable in neglect.

Purpose of the Study:

  • To investigate the dissociation between perception and visually guided action in neglect syndrome.
  • To determine if visual awareness of obstacles is essential for successful navigation.

Main Methods:

  • Two studies were conducted: one with a group of neglect patients performing object bisection and reaching tasks, and another with a patient with visual extinction performing a reaching task.
  • Tasks involved navigating around obstacles in the workspace.

Main Results:

Related Experiment Videos

  • Patients successfully accounted for obstacles on the neglected side during reaching tasks.
  • This occurred despite deficits in explicit perceptual tasks involving the same neglected information.

Conclusions:

  • Visuomotor control, associated with the dorsal stream, appears distinct from visual perception, linked to the ventral stream.
  • On-line visuomotor control may operate independently of conscious visual awareness in neglect.