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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: May 23, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Does spatial cueing affect line bisection in chronic hemianopia?

C Kuhn1, A Rosenthal, P Bublak

  • 1Clinical Neuropsychology Unit at Saarland University, Germany.

Neuropsychologia
|April 7, 2012
PubMed
Summary
This summary is machine-generated.

Spatial cueing did not alter the hemianopic line bisection error (HLBE) in patients with homonymous hemianopia. This suggests that attentional mechanisms do not explain the typical contralesional bias observed in these patients.

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Published on: March 18, 2019

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06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Psychology

Background:

  • Patients with homonymous hemianopia exhibit a contralesional shift in line bisection, known as the hemianopic line bisection error (HLBE).
  • The underlying causes of this spatial bias remain debated, with attention being a potential factor.

Purpose of the Study:

  • To investigate whether spatial cueing of attention influences the hemianopic line bisection error (HLBE) in patients with homonymous hemianopia.
  • To differentiate between attentional and other potential explanations for the HLBE.

Main Methods:

  • A computerized line bisection task was administered to 20 patients with homonymous hemianopia, 10 healthy controls, and 10 neurological controls.
  • Spatial attention was manipulated using cues presented at different positions relative to the horizontal line.
  • Line bisection performance was assessed under four cueing conditions (far left, mid-left, mid-right, far-right).

Main Results:

  • All hemianopic patients demonstrated the typical HLBE towards their blind visual field.
  • Spatial cueing did not significantly affect the HLBE in patients with homonymous hemianopia.
  • Cueing effects were observed in patients with visuospatial neglect, confirming the manipulation's efficacy.

Conclusions:

  • The findings argue against attentional explanations for the hemianopic line bisection error (HLBE).
  • The results suggest that the spatial bias in homonymous hemianopia may stem from non-attentional mechanisms.
  • Further research is needed to elucidate the precise neural underpinnings of the HLBE.