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Impaired size processing for single objects after hemispatial neglect.

M Harvey1, T Krämer, I D Gilchrist

  • 1Department of Psychology, University of Glasgow, Glasgow, UK.

Neuroreport
|December 1, 2001
PubMed
Summary
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Some patients with hemispatial neglect have altered size perception. This study found that some neglect patients misjudge the absolute size of single objects, indicating a deficit in spatial processing.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Psychology

Background:

  • Hemispatial neglect is a cognitive disorder affecting spatial awareness.
  • Previous research linked hemispatial neglect to deficits in horizontal size perception, typically using comparative tasks.
  • The current study investigates size perception using single stimuli to assess absolute length computation.

Purpose of the Study:

  • To determine if hemispatial neglect patients exhibit deficits in absolute horizontal length perception.
  • To explore the relationship between size perception deficits and hemianopia in neglect patients.

Main Methods:

  • Ten patients with hemispatial neglect (five with hemianopia, five without) and two control groups participated.
  • Participants verbally judged the length of single horizontal lines presented at varying locations.

Related Experiment Videos

  • Line lengths varied (3, 3.5, 4 inches) across the visual field from left to right.

    • Main Results:

    • Three out of ten neglect patients demonstrated a size processing deficit, judging left-sided single objects as smaller than right-sided ones.
    • This deficit in absolute size perception was independent of hemianopia.
    • The findings suggest a specific impairment in processing the absolute horizontal length of stimuli.

    Conclusions:

    • Hemispatial neglect can involve a deficit in the absolute perception of horizontal size, even with single stimuli.
    • This size perception impairment is not solely dependent on comparative judgments or the presence of hemianopia.
    • The results highlight a potential disruption in the neural mechanisms underlying spatial magnitude estimation in some neglect patients.