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Related Experiment Videos

Contrast sensitivity loss in the neglected hemifield

P Angelelli1, M De Luca, D Spinelli

  • 1IRCCS Santa Lucia, Roma. Angelelli@uniromal.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|April 16, 1998
PubMed
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Right brain-damaged patients with visuospatial neglect show reduced contrast sensitivity in their contralesional visual hemifield. This visual impairment was specific to neglect patients, not control groups.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Psychology

Background:

  • Unilateral visuospatial neglect is a cognitive disorder often resulting from right hemisphere brain damage.
  • Patients with neglect exhibit deficits in attending to or perceiving stimuli in the visual field contralateral to the brain lesion.
  • The underlying visual processing mechanisms affected by neglect are not fully understood.

Purpose of the Study:

  • To investigate contrast sensitivity in patients with unilateral visuospatial neglect.
  • To determine if visual field deficits in neglect are related to basic visual processing impairments.
  • To compare contrast sensitivity between neglect patients and control groups with and without brain damage.

Main Methods:

  • Contrast sensitivity to sinusoidal gratings (1, 2, 4, 8 c/deg) was measured in both visual hemifields.

Related Experiment Videos

  • Participants included ten right brain-damaged (RBD) patients with neglect, ten left brain-damaged (LBD) patients without neglect, and ten RBD patients without neglect.
  • A two-alternative forced-choice technique was used with stimuli presented at 3 deg eccentricity.

    • Main Results:

    • Patients with neglect demonstrated significantly reduced contrast sensitivity in their contralesional hemifield compared to their ipsilesional hemifield.
    • No significant difference in contrast sensitivity between hemifields was observed in the LBD or control RBD groups.
    • These visual field differences were present despite normal visual fields on standard clinical assessment.

    Conclusions:

    • Visuospatial neglect is associated with a fundamental visual processing deficit in the contralesional hemifield.
    • This impairment in contrast sensitivity may contribute to the attentional and perceptual deficits seen in neglect.
    • Findings highlight the importance of assessing basic visual function in patients with neurological damage and neglect.