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Related Concept Videos

Visual System01:26

Visual System

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...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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.
Vision01:24

Vision

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.
Perceptual Constancy01:12

Perceptual Constancy

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...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
Color Vision01:24

Color Vision

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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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Visual sensitivity underlying changes in visual consciousness.

David Alais1, John Cass, Robert P O'Shea

  • 1School of Psychology, University of Sydney, Sydney, New South Wales 2006, Australia.

Current Biology : CB
|July 6, 2010
PubMed
Summary
This summary is machine-generated.

Binocular rivalry involves alternating conscious perception between two competing visual stimuli. New research challenges existing theories by demonstrating complementary changes in visual sensitivity during dominance and suppression phases.

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Published on: March 18, 2019

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Binocular rivalry is a phenomenon where perception alternates between two competing visual stimuli presented to each eye.
  • A dominant theory posits reciprocal neural inhibition and adaptation underlie rivalry, but lacks empirical support regarding visual sensitivity changes.

Purpose of the Study:

  • To investigate the dynamic changes in visual sensitivity during binocular rivalry.
  • To reconcile the discrepancy between the adaptation theory and existing sensitivity data.

Main Methods:

  • Utilized novel probe stimuli and an advanced methodology to measure visual sensitivity during rivalry.
  • Conducted experiments to precisely track sensitivity fluctuations in dominant and suppressed visual pathways.

Main Results:

  • Contrary to previous findings, visual sensitivity exhibited predicted complementary changes during dominance and suppression.
  • Sensitivity in the dominant pathway decreased, while sensitivity in the suppressed pathway increased over time.

Conclusions:

  • The study's findings support the reciprocal inhibition and adaptation model of binocular rivalry.
  • Demonstrated dynamic changes in visual sensitivity, aligning with theoretical predictions and resolving a key inconsistency.