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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.
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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...
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.
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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Related Experiment Video

Updated: Jun 5, 2026

Cross-Modal Multivariate Pattern Analysis
13:51

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Top-down effects on early visual processing in humans: a predictive coding framework.

Karsten Rauss1, Sophie Schwartz, Gilles Pourtois

  • 1Department of Neuroscience, University of Geneva, Switzerland; Geneva Neuroscience Center, University of Geneva, Switzerland. karsten.rauss@uni-tuebingen.de

Neuroscience and Biobehavioral Reviews
|December 28, 2010
PubMed
Summary
This summary is machine-generated.

Early visual processing, specifically the C1 component of visual evoked potentials, is not solely determined by stimulus attributes. Recent human studies show it is influenced by cognitive factors, challenging older theories.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The C1 component of visual evoked potentials was traditionally thought to reflect primary visual cortex (V1) activity solely influenced by low-level stimulus features.
  • This notion suggested C1 was impermeable to top-down cognitive modulation.

Purpose of the Study:

  • To review the historical understanding of the C1 component and its link to V1.
  • To present conflicting evidence challenging the passive view of C1.
  • To propose a theoretical framework for cognitive modulation of early visual processing.

Main Methods:

  • Review of seminal studies on C1.
  • Analysis of conflicting evidence from animal and human neuroimaging studies.
  • Overview of recent electroencephalography (EEG) and magnetoencephalography (MEG) findings.

Main Results:

  • Evidence suggests that initial V1 activity, reflected in the C1 component, is modulated by higher-level cognitive factors.
  • This contradicts the long-held belief of C1's impermeability to top-down effects.

Conclusions:

  • The earliest stages of visual processing are not exclusively driven by bottom-up stimulus information.
  • A predictive coding framework can explain how cognitive factors influence early visual activity in V1.