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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...
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Physiological Foundation of Stress01:24

Physiological Foundation of Stress

Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
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"...
Psychological Responses to Stress01:20

Psychological Responses to Stress

Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...

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Related Experiment Video

Updated: Jun 26, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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A Cerebral Basis for Visual Discomfort and Visual Stress.

Paul B Hibbard1, Peter Allen2, Jordi M Asher1

  • 1School of Psychology, University of Stirling, Stirling FK9 4LA, UK.

Vision (Basel, Switzerland)
|June 25, 2026
PubMed
Summary

Visual discomfort, often affecting neurodivergent individuals, may arise from mismatches in visual stimuli between natural and urban environments. Interventions include environmental changes and personalized optical treatments to improve visual accessibility.

Keywords:
cortical excitationefficient encodingflickerimage statisticslightingphantom arrayprecision tintssensory sensitivityvisual discomfortvisual stress

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Last Updated: Jun 26, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

A Method to Quantify Visual Information Processing in Children Using Eye Tracking
09:47

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

Published on: July 9, 2016

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
09:42

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Area of Science:

  • Neuroscience
  • Vision Science
  • Environmental Psychology

Background:

  • Visual discomfort is a common subjective experience triggered by specific visual stimuli.
  • It disproportionately affects individuals with heightened sensory sensitivities, including neurodivergent populations.
  • Current understanding suggests a potential mismatch between artificial and natural visual environments.

Purpose of the Study:

  • To explore the link between visual stimuli characteristics and discomfort.
  • To propose a cerebral mechanism explaining visual stress and individual differences.
  • To identify potential interventions for mitigating visual discomfort.

Main Methods:

  • Discussing the inefficient processing of specific spatial, chromatic, and temporal visual characteristics.
  • Proposing a cerebral mechanism for visual discomfort.
  • Reviewing potential environmental and individual-level interventions.

Main Results:

  • Visual discomfort may stem from a mismatch between human-made and natural visual environments.
  • Certain visual stimuli characteristics are processed inefficiently by the visual system.
  • A proposed cerebral mechanism explains discomfort and individual susceptibility variations.

Conclusions:

  • Environmental modifications and personalized optical treatments can reduce visual stress.
  • Creating visually accessible and inclusive environments requires interdisciplinary collaboration.
  • Further research bridging vision science, design, and neuroscience is essential.