Related Experiment Video
Updated: Sep 3, 2025
08:42
Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
Published on: February 8, 2020
10.1K
A model for the development of binocular congruence in primary visual cortex
Manula A Somaratna1, Alan W Freeman2
1Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, 2000, Australia.
Scientific Reports
|July 25, 2022
Summary
Visual experience aligns orientation preferences between eyes after opening. A model shows Hebbian plasticity in the visual cortex creates this binocular congruence, with ocular dominance as a byproduct.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Visual System Development
Background:
- Neurons in the primary visual cortex exhibit orientation selectivity.
- Preferred orientation is largely consistent between the two eyes.
- Monocular orientation preferences are uncorrelated before eye opening, raising questions about their alignment during visual experience.
Purpose of the Study:
- To model the process by which monocular orientation preferences become aligned after eye opening.
- To investigate the role of Hebbian plasticity in achieving binocular congruence of orientation tuning.
Main Methods:
- Simulated the cat's visual system using computational modeling.
- Incorporated on-centre and off-centre channels from both eyes converging onto primary visual cortex neurons.
- Modeled development in two phases involving Hebbian plasticity at the geniculocortical synapse.
Main Results:
- The model demonstrated that initial activity waves lead to differing orientation tuning between eyes.
- Post-eye opening, synaptic plasticity reduced interference by up-regulating inputs from one eye, achieving binocular congruence.
- Orthogonal orientation preferences at the end of the first phase predicted ocular dominance.
Conclusions:
- Hebbian plasticity in the geniculocortical synapse can explain the acquired congruence of orientation tuning between the two eyes.
- Ocular dominance appears to be a byproduct of the mechanism that establishes binocular congruence.
Related Concept Videos
01:24Vision
55.1K
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.
55.1K
01:26Visual System
667
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...
Once through the pupil, the light passes through the lens, a...
667
01:20Anatomy of the Eyeball
7.5K
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...
7.5K
01:15Depth Perception and Spatial Vision
872
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.
872
01:21Association Areas of the Cortex
6.1K
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,...
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,...
6.1K
01:14Motor and Sensory Areas of the Cortex
4.5K
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....
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....
4.5K