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Related Concept Videos

Visual System01:26

Visual System

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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.
Once through the pupil, the light passes through the lens, a...
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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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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The Retina01:32

The Retina

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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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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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: Apr 30, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Face-selective neurons maintain consistent visual responses across months.

David B T McMahon1, Adam P Jones2, Igor V Bondar3

  • 1Section on Cognitive Neurophysiology and Imaging, Laboratory of Neuropsychology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892; mcmahond@mail.nih.gov.

Proceedings of the National Academy of Sciences of the United States of America
|May 7, 2014
PubMed
Summary
This summary is machine-generated.

Face-selective neurons in the macaque brain remain stable over a year, showing consistent visual responses. This suggests these neurons in the anterior fundus (AF) face patch prioritize stable face perception over neural plasticity.

Keywords:
fMRIphysiologyvision

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Area of Science:

  • Neuroscience
  • Primate Cognition
  • Visual Processing

Background:

  • Face perception relies on specialized brain regions in primates.
  • Neuronal representations of faces might change with experience over time.
  • Previous studies assessed neuronal function over short durations, limiting long-term understanding.

Purpose of the Study:

  • To investigate the long-term stability of face-selective neurons.
  • To determine if neuronal response profiles change over months or years.
  • To understand the role of stability versus plasticity in face perception.

Main Methods:

  • Utilized chronically implanted microwire electrodes in macaque monkeys.
  • Employed functional MRI (fMRI) for precise targeting of the anterior fundus (AF) face patch.
  • Conducted longitudinal tracking of individual neuron responses over one year.

Main Results:

  • Face-selective cells in the AF face patch exhibited highly consistent visual response patterns.
  • Neuronal response profiles remained stable across months, unaffected by daily experiences.
  • Distinct selectivity profiles served as unique 'fingerprints' for individual neurons.

Conclusions:

  • Neurons in the AF face patch are specialized for stable aspects of face recognition.
  • These findings challenge the notion of constant neural plasticity in face processing.
  • The brain prioritizes stable representations for enduring perceptual tasks like individual recognition.