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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.

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...

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....

Depth Perception and Spatial Vision

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 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.

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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:
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Related Experiment Video

Updated: Jul 10, 2025

A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity

A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity

Published on: May 7, 2017

Visual experience induces 4-8 Hz synchrony between V1 and higher-order visual areas.

Yu Tang¹, Catherine Gervais¹, Rylann Moffitt¹

¹Department of Biological Sciences, Purdue Institute for Integrative Neuroscience, Purdue Autism Research Center, Purdue University, West Lafayette, IN 47907, USA.

|November 24, 2023

Summary

Visual familiarity is encoded by 4-8 Hz brain oscillations in mouse visual cortex. These oscillations synchronize between primary visual cortex (V1) and higher-order visual areas (HVAs) for distinct visual feature processing and memory.

Keywords:

CP: Neuroscience familiarity higher-order visual areas theta oscillations visual cortex

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Last Updated: Jul 10, 2025

A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity

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Area of Science:

Neuroscience
Systems Neuroscience
Visual Processing

Background:

Visual experience generates persistent 4-8 Hz oscillations in the primary visual cortex (V1), linked to visual familiarity.
Higher-order visual areas (HVAs) are specialized for distinct visual features, but their role in memory processing remains unclear.

Purpose of the Study:

To investigate whether visual memories are processed and stored within distinct visual streams.
To examine the role of 4-8 Hz oscillations and inter-areal communication in memory-related behaviors.

Main Methods:

Phase synchronization analysis of 4-8 Hz oscillations between V1 and HVAs (lateromedial - LM, anterolateral).
Directed information analysis to assess functional connectivity.
Optogenetic inactivation of LM to evaluate its role in V1 oscillations and behavior.

Main Results:

V1 and LM, but not V1 and anterolateral, showed increased 4-8 Hz phase synchronization after stimulus entrainment.
Directed information analysis revealed changes in top-down functional connectivity between V1 and HVAs.
LM inactivation reduced V1 oscillation peaks and impaired visual discrimination behavior.

Conclusions:

4-8 Hz familiarity-evoked oscillations are specific to distinct visual features and are present in corresponding HVAs.
These oscillations facilitate inter-areal communication between V1 and HVAs during memory-related behaviors.