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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Visual System01:26

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Related Experiment Video

Updated: Sep 23, 2025

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior
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Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

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Gaze following requires early visual experience.

Ehud Zohary1, Daniel Harari2, Shimon Ullman2

  • 1The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

Children with early cataracts who received late-onset sight restoration failed to develop normal gaze following. This suggests early visual experience is crucial for learning fundamental social vision skills.

Keywords:
blindcataractgazejoint attentionvision

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Area of Science:

  • Developmental psychology
  • Neuroscience
  • Ophthalmology

Background:

  • Gaze understanding, crucial for inferring intentions, typically develops naturally in infancy.
  • The ability to learn gaze following later in life after severe early visual impairment remains unclear.

Purpose of the Study:

  • To investigate if gaze following can be acquired after sight restoration in individuals with early bilateral congenital cataracts treated in late childhood.
  • To explore the interplay of nature and nurture in the development of visual social cues.

Main Methods:

  • Studied gaze following in Ethiopian patients with bilateral congenital cataracts treated in late childhood.
  • Compared postoperative gaze behavior to controls, analyzing head- and eye-based gaze cues.
  • Developed an unsupervised learning model for gaze direction under image blur.

Main Results:

  • Patients showed improved visual acuity post-surgery but failed to exhibit eye gaze-following behaviors.
  • Gaze fixation on eyes was significantly less in patients compared to controls.
  • A model demonstrated head-based gaze following can develop with blur, but eye-based following requires early visual input.

Conclusions:

  • Restored vision in late childhood does not enable automatic eye gaze following due to the lack of critical early visual experience.
  • Unsupervised visual skills learned in infancy are difficult to acquire later, even with restored visual acuity.
  • Prolonged early visual deprivation creates fundamental barriers to spontaneous recovery of social vision abilities.