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Related Experiment Videos

Visual neglect.

Paolo Bartolomeo1

  • 1Inserm Unit 610 and Federation of Neurology, Salpêtrière Hospital, University Pierre and Marie Curie - Paris 6, Paris, France. paolo.bartolomeo@chups.jussieu.fr

Current Opinion in Neurology
|July 11, 2007
PubMed
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Left visual neglect, a consequence of right hemisphere damage, is increasingly understood through new techniques. Research suggests large-scale brain network dysfunction, not single lesions, underlies this condition.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Left visual neglect frequently follows right hemisphere lesions.
  • Diagnosis is crucial due to available behavioral and pharmacological treatments.
  • Neglect offers insights into consciousness, perception, and attention mechanisms.

Purpose of the Study:

  • To review recent findings on the functional mechanisms and anatomical bases of left visual neglect.
  • To highlight the role of advanced neuroimaging and stimulation techniques in understanding neglect.

Main Methods:

  • Review of recent behavioral findings.
  • Application of advanced techniques including transcranial magnetic stimulation (TMS).
  • Analysis of direct cortical/subcortical stimulation during surgery and diffusion tensor imaging (DTI) tractography.

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Main Results:

  • New techniques provide evidence for functional mechanisms and anatomical bases of neglect.
  • Several component deficits interact to produce various forms of neglect.
  • Evidence points towards large-scale brain network dysfunction as a key factor.

Conclusions:

  • Dysfunction in large-scale brain networks, often due to white matter disconnection, is a primary cause of neglect.
  • Neglect signs may result from network dysfunction rather than isolated cortical lesions.
  • Understanding these networks is key for diagnosing and treating visual neglect.