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Related Concept Videos

Perceptual Constancy01:12

Perceptual Constancy

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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...
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Piaget's Stage 1 of Cognitive Development01:14

Piaget's Stage 1 of Cognitive Development

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The sensorimotor stage, the initial phase of Jean Piaget's theory of cognitive development, spans the first two years of a child's life. During this period, infants actively engage with their surroundings, building cognitive awareness through direct interaction with the world. This interaction is primarily based on sensory perception and motor actions, allowing infants to gradually understand basic physical properties and predict how objects interact within their environment.
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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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The Nativist Approach01:21

The Nativist Approach

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The nativist approach to infant cognitive development proposes that infants are born with inherent knowledge structures that allow them to interpret the world almost immediately. This perspective contrasts with earlier developmental theories, such as those proposed by Jean Piaget, which emphasized a more gradual acquisition of cognitive abilities through interaction with the environment. One key concept in this approach is object permanence — the understanding that objects continue to...
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Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Related Experiment Video

Updated: Mar 28, 2026

A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras
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A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras

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Pre-constancy Vision in Infants.

Jiale Yang1, So Kanazawa2, Masami K Yamaguchi1

  • 1Department of Psychology, Chuo University, 742-1 Higashi-Nakano, Hachioji, Tokyo 192-0393, Japan.

Current Biology : CB
|December 17, 2015
PubMed
Summary
This summary is machine-generated.

Infants initially detect illumination changes but lose this ability as they develop perceptual constancy. This suggests early visual development involves losing sensitivity to image variations to perceive stable object properties.

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Area of Science:

  • Developmental psychology
  • Visual neuroscience
  • Infant perception

Background:

  • Perceptual constancy allows stable perception of object properties despite changing visual input.
  • It is traditionally thought to develop through postnatal learning, building on basic visual functions.
  • Early visual development involves shifts in sensitivity to image properties.

Purpose of the Study:

  • To investigate the developmental trajectory of visual sensitivity in infants.
  • To explore the relationship between sensitivity to illumination changes and the development of perceptual constancy.
  • To understand how the visual system transitions from processing image variations to stable object properties.

Main Methods:

  • Behavioral experiments with 3- to 8-month-old infants.
  • Assessing infants' ability to discriminate changes in illumination and surface properties (glossy/matte).
  • Identifying age-related changes in visual discrimination abilities.

Main Results:

  • 3- to 4-month-old infants show high sensitivity to illumination-induced image changes.
  • This sensitivity is lost by 5 months of age, with a transitional period of difficulty at 5-6 months.
  • By 7-8 months, infants develop the ability to perceive surface properties like glossiness.

Conclusions:

  • Acquiring perceptual constancy involves a developmental loss of sensitivity to transient image information.
  • The immature visual system may initially process local image features directly.
  • Later development establishes stable neural representations for object properties, sacrificing sensitivity to image variations.