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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Related Experiment Video

Updated: Jun 16, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Line bisection in unilateral homonymous visual field defects.

Susanne Schuett1, Ruth Dauner, Josef Zihl

  • 1Department of Psychology, University of Durham, UK. susanne.schuett@durham.ac.uk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|February 23, 2010
PubMed
Summary

The contralesional line bisection error occurs in various unilateral visual field defects, not just hemianopia. This error is linked to the defect

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Related Experiment Videos

Last Updated: Jun 16, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

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Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

Published on: August 11, 2016

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Psychology

Background:

  • Contralesional line bisection error is a known phenomenon in unilateral homonymous hemianopia.
  • Previous studies used small sample sizes and did not investigate other visual field defects.
  • Horizontal line bisection has not been explored in conditions beyond hemianopia.

Purpose of the Study:

  • To investigate horizontal line bisection in a large, representative sample of patients with unilateral homonymous visual field defects.
  • To determine the magnitude and direction of the line bisection error across different visual field defects.
  • To clarify if the bisection error is specific to hemianopia or a broader phenomenon.

Main Methods:

  • Recruited 129 patients with unilateral homonymous visual field defects.
  • Included patients with hemianopia (60.5%), upper/lower quadranopia (24.8%), and paracentral scotoma (14.7%).
  • Assessed horizontal line bisection to measure error magnitude and direction.

Main Results:

  • Contralesional line bisection error was observed in hemianopia, quadranopia, and paracentral scotoma.
  • Neither the type nor severity of the visual field defect influenced the bisection error.
  • The side of the visual field defect correlated with the horizontal direction of the error.

Conclusions:

  • Contralesional line bisection error is not exclusive to hemianopia but common in all unilateral homonymous visual field defects.
  • The visual field defect is not the direct cause of the bisection error.
  • The visual field defect may contribute to the contralesional bisection error, though not its primary cause.