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Related Concept Videos

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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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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Related Experiment Video

Updated: Mar 23, 2026

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
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From faces to hands: Changing visual input in the first two years.

Caitlin M Fausey1, Swapnaa Jayaraman2, Linda B Smith2

  • 1Department of Psychology, University of Oregon, Eugene, OR 97403, United States.

Cognition
|April 5, 2016
PubMed
Summary
This summary is machine-generated.

Infants see faces more often early in development, followed by increased visual input of hands interacting with objects. This shift highlights developmental changes in social visual experiences.

Keywords:
Egocentric visionFacesHandsHead cameraInfancyScene statistics

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Area of Science:

  • Developmental Psychology
  • Cognitive Neuroscience
  • Human Perception

Background:

  • Human development is intrinsically linked to social context.
  • Faces and hands are primary sources of social information for infants.
  • Understanding visual input during early development is crucial for cognitive and social growth.

Purpose of the Study:

  • To quantify the visual frequency of faces and hands in infants' everyday environments.
  • To investigate the developmental trajectory of face and hand visual input from 1 to 24 months.
  • To explore the relationship between face and hand visual experiences and object interaction.

Main Methods:

  • Collected 143 hours of infant-perspective video data using head-mounted cameras.
  • Analyzed scenes from 34 infants aged 1 month to 2 years.
  • Sampled video data at 1/5 Hz to assess visual frequency and co-occurrence.

Main Results:

  • A distinct developmental shift was observed: earlier dense face input followed by later dense hand input.
  • Hands were predominantly seen in contact with objects across all ages.
  • The co-occurrence of hands and faces was higher than statistically expected.

Conclusions:

  • The observed shift from face to hand visual input suggests a principled transition in infant visual experience.
  • This transition may be influenced by developmental "gates" that regulate the timing and statistics of visual input.
  • Findings provide insights into how early visual experiences shape social-cognitive development.