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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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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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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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.
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Color Vision01:24

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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 3, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Spatial phase sensitivity of complex cells in primary visual cortex depends on stimulus contrast.

H Meffin1, M A Hietanen1, S L Cloherty2

  • 1National Vision Research Institute, Australian College of Optometry, Carlton, Victoria, Australia; ARC Centre of Excellence for Integrative Brain Function, Department of Optometry and Vision Sciences, University of Melbourne, Parkville, Victoria, Australia; and.

Journal of Neurophysiology
|September 18, 2015
PubMed
Summary

Complex cells in the visual cortex show increased phase sensitivity at low contrasts, primarily due to spatial processing changes. These cells in supragranular layers exhibit dynamic spatial summation, differing from simple cells.

Keywords:
area 17cat cortexcomplex cellvisual system

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Area of Science:

  • Neuroscience
  • Visual Cortex Physiology

Background:

  • Neurons in the primary visual cortex are categorized as simple (phase-sensitive) or complex (less phase-sensitive).
  • Previous studies using drifting gratings indicated increased phase sensitivity in complex cells at low contrast and after adaptation, unlike simple cells.

Purpose of the Study:

  • To investigate whether contrast-dependent phase sensitivity in complex cells arises from spatial or temporal processing changes.
  • To differentiate the roles of spatial and temporal summation in complex cell responses using contrast-reversing gratings.

Main Methods:

  • Stimulated complex cells with spatially stationary, contrast-reversing gratings.
  • Varied spatial phase and contrast to analyze phase sensitivity.
  • Examined spatiotemporal response characteristics and cortical layer distribution.

Main Results:

  • The rise in phase sensitivity at low contrasts was mainly attributed to alterations in spatial phase sensitivities of complex cells.
  • Complex cells did not exhibit the spatiotemporal response patterns of simple cells at low contrasts.
  • Complex cells showing increased spatial phase sensitivity were predominantly found in supragranular cortical layers.

Conclusions:

  • Complex cells in the supragranular layers of cat cortex possess dynamic spatial summation properties.
  • The underlying mechanisms of complex cell receptive fields vary across different cortical layers.