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Vision

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.

Motor and Sensory Areas of the Cortex

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.

Parallel Processing

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...

Visual System

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...

Color Vision

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.

Association Areas of the Cortex

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,...

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Related Experiment Video

Updated: Jul 4, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Rapid recurrent processing gates awareness in primary visual cortex.

C N Boehler¹, M A Schoenfeld, H-J Heinze

¹Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany.

Proceedings of the National Academy of Sciences of the United States of America

|June 14, 2008

Summary

This summary is machine-generated.

Recurrent processing in the primary visual cortex (V1) correlates with visual awareness. Attention and awareness involve distinct recurrent processing operations, differentiating their neural mechanisms.

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Last Updated: Jul 4, 2026

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Published on: August 1, 2018

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Area of Science:

Neuroscience
Cognitive Neuroscience
Visual Perception

Background:

Visual awareness is theorized to depend on recurrent processing in early visual areas, particularly the primary visual cortex (V1).
Understanding the neural basis of visual awareness and its distinction from attention is crucial for cognitive neuroscience.

Purpose of the Study:

To investigate the role of recurrent processing in V1 in visual awareness.
To differentiate the neural operations underlying attention and awareness.

Main Methods:

Utilized high spatiotemporal resolution magnetoencephalography (MEG).
Employed a substitution masking paradigm with individually adjusted masking proportions.
Compared neuromagnetic responses to effectively and ineffectively masked visual targets.

Main Results:

Identified modulation of recurrent activity in V1 shortly after the feedforward processing sweep.
Observed this modulation preceding attention-dependent recurrent activity in V1.
Demonstrated a temporal dissociation between feedforward processing, recurrent activity related to awareness, and attention-dependent modulations.

Conclusions:

Recurrent processing in V1 is directly correlated with visual awareness.
Attention and awareness engage distinct recurrent processing mechanisms.
Provides direct evidence for separate neural operations supporting awareness and attentional control.