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Related Concept Videos

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.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
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.
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...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

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Related Experiment Video

Updated: Jun 5, 2026

How to Create and Use Binocular Rivalry
14:34

How to Create and Use Binocular Rivalry

Published on: November 10, 2010

When and where is binocular rivalry resolved in the visual cortex?

Michael A Pitts1, Antígona Martínez, Steven A Hillyard

  • 1Department of Neurosciences, University of California San Diego, La Jolla, CA 92093-0608, USA. michaelapitts@ucsd.edu

Journal of Vision
|December 31, 2010
PubMed
Summary

Binocular rivalry resolution occurs later than initially thought. Early visual cortex activity reflects conscious perception only after initial sensory processing, not during the earliest stages.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Early visual areas, including striate cortex (V1), are implicated in resolving binocular rivalry.
  • The precise timing of neural activity related to rivalry and its link to subjective perception remain unclear.

Purpose of the Study:

  • To investigate the temporal dynamics of neural activity in early visual cortex during binocular rivalry.
  • To determine when neural signals associated with subjective perception emerge during rivalry.

Main Methods:

  • Used an intermittent stimulation design to measure event-related potentials (ERPs).
  • Compared ERPs during binocular rivalry with ERPs during physical alternations of stimuli.
  • Analyzed early cortical components (e.g., C1) and later occipital ERPs.

Main Results:

  • The earliest cortical component (C1, 60-100 ms) showed no difference in amplitude for high vs. low spatial frequencies during rivalry, unlike during physical alternation.
  • Later occipital ERPs (130-160 ms) differed based on perception in both rivalry and physical alternation conditions.
  • Neural activity coupled with the dominant percept in early visual cortex emerges at delayed latencies during rivalry.

Conclusions:

  • Binocular rivalry resolution does not occur before or during the initial cortical response (60-100 ms).
  • Neural signals corresponding to conscious perception during rivalry emerge in early visual cortex at later time points (130-160 ms).
  • This suggests a delayed emergence of percept-specific neural activity in early visual areas during binocular rivalry.