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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"...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...

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Related Experiment Video

Updated: May 9, 2026

A Simple Behavioral Assay for Testing Visual Function in Xenopus laevis
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Testing for optic ataxia in a blind field.

Aarlenne Z Khan1, Laure Pisella, Ludovic Delporte

  • 1INSERM, U1028, CNRS, UMR5292, Lyon Neuroscience Research Center, ImpAct Team Bron, France ; Mouvement et Handicap, Hospices Civils de Lyon, Inserm et Université de Lyon Bron, France.

Frontiers in Human Neuroscience
|July 31, 2013
PubMed
Summary
This summary is machine-generated.

A novel remapping paradigm allows for the observation of optic ataxia (a reaching deficit) even in blind visual fields. This method helps diagnose visuo-manual transformation deficits in patients with conditions like hemianopia.

Keywords:
Bálint's syndromeeye movementshemianopiareachingupdating

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Last Updated: May 9, 2026

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Ophthalmology

Background:

  • Optic ataxia, a deficit in reaching and grasping, stems from posterior parietal cortex damage.
  • Balint's syndrome often includes optic ataxia and visual field defects, complicating diagnosis.
  • Visual field defects like hemianopia can obscure higher-level visual deficits such as optic ataxia.

Purpose of the Study:

  • To demonstrate a novel paradigm for detecting optic ataxia in blind visual fields.
  • To assess visuo-manual transformation deficits in patients with co-occurring optic ataxia and hemianopia.

Main Methods:

  • Utilized a remapping paradigm involving eye movements and target updating.
  • Measured reach endpoints in static and dynamic conditions for a patient with left optic ataxia and left lower quadrantanopia.
  • Compared patient's reach accuracy to control subjects.

Main Results:

  • Optic ataxia was observed in the patient's blind visual field during dynamic conditions.
  • Reaching errors correlated with the updated internal representation of the target, not initial viewing location.
  • Partial target location updating was observed in both patient and controls.

Conclusions:

  • The remapping paradigm successfully identifies optic ataxia in blind visual fields.
  • This method enables diagnosis of visuo-manual transformation deficits even with coexisting hemianopia.
  • The findings advance understanding of visual processing and sensorimotor integration.