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Related Concept Videos

Visual System01:26

Visual System

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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...
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Encoding01:19

Encoding

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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
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Parallel Processing01:20

Parallel Processing

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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...
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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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Gestalt Principles of Perception01:21

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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Visual Agnosia

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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...
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Related Experiment Video

Updated: Sep 2, 2025

VisualEyes: A Modular Software System for Oculomotor Experimentation
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Published on: March 25, 2011

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Visual encoding: Principles and software.

Brian A Wandell1, David H Brainard2, Nicolas P Cottaris2

  • 1Psychology Department and the Stanford Center for Image Systems Engineering, Stanford University, Stanford, CA, United States.

Progress in Brain Research
|August 8, 2022
PubMed
Summary
This summary is machine-generated.

Scientists developed open-source software to model how the human eye encodes light. This tool uses principles of optics and photoreceptor encoding for initial visual processing calculations.

Keywords:
Computer graphicsCone fundamentalsCone mosaicDisplayIrradianceLensOpticsPhotoreceptorPigment densityPoint spread functionRadianceRetinaipRGC

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Area of Science:

  • Vision science
  • Biophysics
  • Computational neuroscience

Background:

  • The human eye's mechanism for encoding light has been studied for over 200 years.
  • Current understanding covers light transmission, photoreceptor function, and neural encoding.
  • Recent advancements in instrumentation allow precise measurement of optical and photoreceptor parameters.

Purpose of the Study:

  • To implement established principles and parameter estimates of human eye function into an open-source software toolbox.
  • To provide a computational tool for analyzing the initial stages of visual encoding.
  • To describe the underlying principles and usage of the developed software.

Main Methods:

  • Utilized known principles of visual optics and retinal encoding.
  • Integrated newly measured optical and photoreceptor parameters.
  • Developed an open-source software toolbox to model these processes.
  • Described the software's principles and provided usage examples.

Main Results:

  • An open-source software toolbox has been created, embodying human eye optics and photoreceptor encoding principles.
  • The software allows for the computation of initial visual encoding based on specific parameter estimates.
  • The chapter details the methodology and application of these computational tools.

Conclusions:

  • The developed software provides a valuable resource for researchers studying visual encoding.
  • This tool facilitates the modeling of how the human eye processes light.
  • It enables the computation of initial visual encoding, advancing vision science research.