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Related Experiment Videos

Diagonal neglect on cancellation

V W Mark1, K M Heilman

  • 1Department of Neuroscience, University of North Dakota School of Medicine, Fargo, USA. mark@plains.nodak.edu

Neuropsychologia
|November 14, 1997
PubMed
Summary
This summary is machine-generated.

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Patients with right hemisphere injury often exhibit near left neglect, a spatial attention deficit. This study found this neglect persists regardless of cancellation order, suggesting it

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Right hemisphere injury commonly leads to spatial neglect, particularly on the left side of space.
  • Near left ('diagonal') neglect, where patients miss targets nearest their body, is often hypothesized to stem from stimulus order effects like fatigue.

Purpose of the Study:

  • To investigate the persistence of near left neglect in patients with right hemisphere injury.
  • To determine if cancellation order (near vs. far half of the page first) influences the manifestation of near left neglect.
  • To explore the underlying mechanisms of diagonal cancellation neglect.

Main Methods:

  • Nine stroke patients with right hemisphere injury performed a cancellation task.
  • Cancellation order was manipulated: patients cancelled either the near or far half of the page first.

Related Experiment Videos

  • Omission patterns were analyzed across the entire page and within radial halves.

    • Main Results:

    • Near left neglect was largely unaffected by the order in which near and far halves of the page were cancelled.
    • A consistent gradient of omissions was observed, with more errors in the near left region across the entire page and within both radial halves.
    • The findings indicate a persistent pattern of near left neglect regardless of cancellation strategy.

    Conclusions:

    • Diagonal cancellation neglect is likely not due to fatigue or simple stimulus order effects.
    • The results support a consistent, two-dimensional spatial attention disorder in right hemisphere injury.
    • This spatial attention deficit may be influenced by the extent and egocentric location of the visual stimulus array.