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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"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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: Jun 24, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Monocular patching affects inattention but not perseveration in spatial neglect.

S Khurshid1, H Longin, G P Crucian

  • 1Kessler Foundation Research Center, Stroke Research, West Orange, NJ 07052, USA.

Neurocase
|April 17, 2009
PubMed
Summary
This summary is machine-generated.

Monocular patching may help with spatial neglect by improving attention, but not motor control after a stroke. Ipsilesional patching reduced left-sided errors in a line-cancellation task, suggesting a targeted approach for stroke recovery.

More Related Videos

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Related Experiment Videos

Last Updated: Jun 24, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Clinical Psychology

Background:

  • Spatial neglect is a common and disabling deficit following stroke, impacting attention and motor control.
  • Understanding the distinct components of spatial neglect, such as perceptual-attentional and motor-intentional deficits, is crucial for effective treatment.
  • Monocular patching is a potential intervention for spatial neglect, but its efficacy for different symptom subtypes requires investigation.

Observation:

  • A patient with chronic post-stroke left spatial neglect performed a line-cancellation task to assess deficits.
  • Omission errors were linked to a perceptual-attentional 'where' deficit, while perseverative errors were associated with a motor-intentional 'aiming' bias.
  • The study observed the effects of contralesional and ipsilesional patching on these distinct error types.

Findings:

  • Ipsilesional monocular patching significantly reduced left-sided omission errors compared to the unpatched condition (p = .016).
  • Contralesional patching did not affect omission errors (p = .871).
  • Neither patching condition altered the number of perseverative errors, indicating no effect on motor-intentional bias.

Implications:

  • Targeting perceptual-attentional deficits, specifically left-sided omissions, with ipsilesional patching may be a viable strategy in stroke rehabilitation.
  • The findings suggest that different components of spatial neglect may require distinct therapeutic approaches.
  • Further research is warranted to confirm these results and explore the broader clinical utility of targeted monocular patching for spatial neglect.