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Related Concept Videos

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...
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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.

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Related Experiment Video

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Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
06:12

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults

Published on: February 12, 2020

Visual prosthesis.

Peter H Schiller1, Edward J Tehovnik

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA. phschill@mit.edu

Perception
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

Developing a visual prosthesis could help millions of blind individuals. This research explores electrical stimulation of the visual cortex (V1) for artificial vision, advocating animal studies and non-invasive human trials.

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Area of Science:

  • Neuroscience and Biomedical Engineering
  • Visual Prosthesis Research

Background:

  • Over 40 million individuals worldwide are blind, with visual prostheses offering potential restoration of sight.
  • Understanding the visual system's operational characteristics is crucial for designing effective prosthetic devices.

Purpose of the Study:

  • To outline foundational principles for developing a visual prosthesis.
  • To propose a research framework prioritizing animal studies before human implantation.
  • To explore methods for converting visual input into neural stimulation patterns.

Main Methods:

  • Review of visual system principles.
  • Proposal for animal research, specifically targeting area V1 for electrode array implantation.
  • Development of coding strategies to translate camera input into neural stimulation.
  • Advocacy for non-invasive human trials mimicking stimulation effects.

Main Results:

  • Area V1 is identified as a promising target due to its large volume, accommodating extensive electrode arrays.
  • Coding operations are conceptualized to provide shape, motion, and depth perception through electrical stimulation.
  • Non-invasive human experiments are proposed to validate stimulation-induced visual perceptions.

Conclusions:

  • A systematic, animal-first approach is essential for advancing visual prosthesis technology.
  • Targeting area V1 and developing effective coding are key to restoring visual function.
  • Mimicking prosthetic effects in sighted individuals can guide further development.