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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"...

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Related Experiment Video

Updated: Jun 18, 2026

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
05:44

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function

Published on: July 14, 2016

Saccade control after V1 lesion revisited.

Tadashi Isa1, Masatoshi Yoshida

  • 1Department of Developmental Physiology, National Institute for Physiological Sciences, Myodaiji, Okazaki 444-8585, Japan. tisa@nips.ac.jp

Current Opinion in Neurobiology
|November 17, 2009
PubMed
Summary

Even after primary visual cortex (V1) damage, blindsight allows visually guided saccades. However, V1 is crucial for deliberate saccade control, as recovery takes time and saccade dynamics are impaired.

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

Published on: March 18, 2019

Related Experiment Videos

Last Updated: Jun 18, 2026

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
05:44

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function

Published on: July 14, 2016

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

Background:

  • Blindsight demonstrates residual visual function post-primary visual cortex (V1) lesion.
  • The extrageniculate pathway's role in controlling visually guided saccades bypassing V1 has been previously emphasized.

Purpose of the Study:

  • To investigate the role of the primary visual cortex (V1) in the immediate control of visually guided saccades after V1 lesion.
  • To analyze the dynamics of saccades and decision-making thresholds in a monkey model with V1 lesions.

Main Methods:

  • V1 lesion induction in a monkey model.
  • Analysis of saccade dynamics, including trajectory, velocity, and initiation thresholds.
  • Assessment of recovery time for extrageniculate pathway compensation.

Main Results:

  • Recovery of saccade control by the extrageniculate pathway after V1 lesion takes approximately two months.
  • Saccades in V1-lesioned subjects exhibited ballistic trajectories with impaired online corrections.
  • The decision threshold for initiating saccades was significantly lowered post-V1 lesion.

Conclusions:

  • The geniculo-striatal pathway, involving V1, is essential for the immediate and deliberate control of saccades.
  • The extrageniculate pathway's compensation for V1 damage is not immediate and results in altered saccade characteristics.