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Related Experiment Videos

Neglected attention in apparent spatial compression.

Paolo Bartolomeo1, Marika Urbanski, Sylvie Chokron

  • 1French Institute of Biomedical Research, INSERM EMI 007, Centre Paul Broca, 2ter rue d'Alésia, F-75014 Paris, France. paolo@broca.inserm.fr

Neuropsychologia
|November 15, 2003
PubMed
Summary

Patients with left visual neglect and hemianopia show rightward response shifts, but only when visible targets are present. This suggests an attentional bias, not spatial compression, influences their perception of left space.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Left visual neglect is often explained by rightward spatial compression.
  • Previous studies suggested patients systematically shift responses rightward in left space.
  • An alternative hypothesis involves attentional bias towards rightward stimuli.

Purpose of the Study:

  • To investigate the underlying mechanism of rightward spatial shifts in visual neglect.
  • To differentiate between spatial compression and attentional bias accounts.
  • To examine the role of hemianopia in visual neglect symptoms.

Main Methods:

  • Normal participants and patients with right hemisphere lesions (with/without neglect/hemianopia) were tested.
  • Participants marked the perceived location of an arrow on a sheet margin.

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  • Arrow targets included numbers, lines, or blank spaces in different conditions.

    • Main Results:

    • Patients with left neglect, particularly those with hemianopia, showed rightward deviations.
    • These deviations occurred only when visible targets were present.
    • No significant rightward shift was observed in conditions with blank targets.

    Conclusions:

    • The findings support an attentional bias account over spatial compression in visual neglect.
    • Attentional capture by visible stimuli to the right influences spatial perception.
    • Hemianopia exacerbates this attentional bias in patients with neglect.