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Related Concept Videos

Vision01:24

Vision

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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.
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Neuroplasticity01:01

Neuroplasticity

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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Depth Perception and Spatial Vision01:15

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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.
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Visual System01:26

Visual System

2.4K
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...
2.4K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Cortical magnification plus cortical plasticity equals vision?

Richard T Born1, Alexander R Trott2, Till S Hartmann3

  • 1Dept. of Neurobiology, Harvard Medical School, United States; Center for Brain Science, Harvard University, United States.

Vision Research
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

This study explores using the primary visual cortex (V1) for vision restoration. Its large magnification factor offers higher resolution than retinal implants, making V1 a promising target for visual prostheses.

Keywords:
Magnification factorPlasticityPrimary visual cortexV1Vision restorationVisual prosthesis

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Ophthalmology

Background:

  • Current visual prosthesis research primarily targets the retina.
  • Retinal approaches are limited by electrode density and resolution.
  • The retina's magnification factor is constrained by optical design.

Purpose of the Study:

  • To investigate the potential of the primary visual cortex (V1) as a target for visual prostheses.
  • To evaluate if V1's properties can overcome limitations of retinal-based approaches.
  • To explore V1's plasticity for adapting to artificial visual input.

Main Methods:

  • The study proposes bypassing retinal processing and stimulating V1 directly.
  • It leverages the significantly higher magnification factor of V1 compared to the retina.
  • It considers the inherent neuroplasticity of the visual cortex.

Main Results:

  • Primary visual cortex (V1) exhibits a much larger magnification factor (15-20 mm/deg) than the retina (~0.3 mm/deg).
  • This magnification allows for higher image resolution delivery to V1 with existing electrode technology.
  • The visual cortex demonstrates significant plasticity for learning and adapting to novel visual stimuli.

Conclusions:

  • The high magnification factor and plasticity of V1 present a compelling case for its use in vision restoration.
  • Stimulating V1 may offer superior resolution compared to retinal implants.
  • V1 is a viable alternative target for developing advanced visual prostheses.