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Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Parallel interhemispheric processing in hemineglect: relation to visual field defects.

Eva M Müller-Oehring1, Tilman Schulte, Erich Kasten

  • 1Department of Psychiatry and Behavioral Science, Stanford University School of Medicine, Stanford, CA 94305-5723, USA. evamoe@stanford.edu

Neuropsychologia
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

Unconscious visual processing, demonstrated by redundant target effects (RTE), occurs in neglect patients even with visual field defects. This processing may bypass damaged cortical pathways, potentially utilizing subcortical routes.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Parallel interhemispheric processing is crucial for visual exploration and integrating information from both visual fields.
  • Damage to the right temporo-parietal cortex can cause neglect and visual extinction, impairing awareness of contralesional stimuli.
  • Unconscious processing of neglected stimuli has been linked to intact primary visual areas.

Purpose of the Study:

  • To investigate whether unconscious parallel processing relies on visual functional integrity.
  • To compare redundant target effects (RTE) in neglect patients with and without visual field defects (VFDs) against hemianopic patients.

Main Methods:

  • Compared neglect patients (n=11) with visual field defects (VFDs) to hemianopic patients (n=11).
  • Assessed redundant target effects (RTE), a measure of unconscious processing, by comparing reaction times to single vs. paired stimuli.
  • Measured crossed-uncrossed differences (CUDs) to assess processing speed differences between visual hemifields.

Main Results:

  • Neglect patients exhibited RTEs (unconscious processing), while hemianopic patients did not.
  • Neglect patients showed significant crossed-uncrossed differences (CUDs), correlating with VFDs and visual extinction.
  • Extinction, but not RTE, correlated with CUD, suggesting impaired contralesional input detection.

Conclusions:

  • Unconscious parallel processing (RTE) can occur in neglect patients despite visual field deficits.
  • This unconscious processing may be mediated by subcortical pathways when cortical visual input is lacking or delayed.
  • Findings differentiate between conscious awareness (affected by CUD) and unconscious processing (RTE).