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Left unilateral neglect or right hyperattention?

P Bartolomeo1, S Chokron

  • 1INSERM Unit 324, Paris, France.

Neurology
|December 22, 1999
PubMed
Summary
This summary is machine-generated.

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Patients with left neglect show slower responses to both left and right targets as neglect worsens. This supports the hypoattention model, indicating reduced attention in both visual fields, not just a rightward bias.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Left unilateral neglect is interpreted differently, with theories suggesting either reduced left-sided attention or heightened right-sided attention.
  • The right-hyperattention postulate predicts faster right-sided responses with increased neglect severity.
  • The left-hypoattention postulate predicts slower responses in both hemispaces with increased neglect.

Purpose of the Study:

  • To investigate the attentional mechanisms underlying left unilateral neglect.
  • To differentiate between the right-hyperattention and left-hypoattention postulates.

Main Methods:

  • Analysis of manual response times to left- and right-sided targets.
  • Study included 24 patients with right hemisphere lesions and varying degrees of left neglect.

Related Experiment Videos

Main Results:

  • Response times to both left and right targets progressively slowed as neglect severity increased.
  • The slowing of responses to left targets was steeper than that for right targets with increasing neglect.
  • Findings align with the hypoattention account, suggesting reduced attentional resources.

Conclusions:

  • Patients with left neglect exhibit both left hypoattention and a rightward attentional bias.
  • The rightward bias in neglect is characterized by defective, rather than enhanced, attention.
  • The study supports a model where attentional resources are globally diminished.