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Related Concept Videos

Visual Agnosia01:12

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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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,...
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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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Prosopagnosia01:24

Prosopagnosia

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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Understanding Consciousness01:23

Understanding Consciousness

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Consciousness can be defined as the state of being aware of and able to think about one's existence, sensations, and surroundings. It encompasses two major components: awareness and arousal. Awareness pertains to the recognition of environmental stimuli and internal states. At the same time, arousal refers to the physiological readiness to engage with these stimuli, which varies significantly between states like sleep and wakefulness.
Sleep, a crucial state, is characterized by reduced...
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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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Related Experiment Video

Updated: Apr 19, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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Visual consciousness explained by its impairments.

Lionel Naccache1

  • 1aINSERM, Institut du Cerveau et de la Moelle Epinière bUniversité Pierre et Marie Curie, Faculté de Médecine Pitié-Salpêtrière, Paris, France.

Current Opinion in Neurology
|December 10, 2014
PubMed
Summary
This summary is machine-generated.

Investigating visual consciousness through brain-damaged patients and healthy individuals reveals key principles of consciousness. These findings, including blindsight and neglect, support the global workspace model and aid in managing neurovisual disorders.

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Related Experiment Videos

Last Updated: Apr 19, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurophysiology

Background:

  • Recent advancements in visual consciousness research stem from studying both brain-damaged patients and healthy individuals.
  • Neuropsychological syndromes offer insights into the neurophysiology of consciousness through distinct dissociations.

Purpose of the Study:

  • To review major findings from neuropsychological syndromes.
  • To explain how these findings align with a global workspace model.
  • To evaluate the generality of identified principles in healthy individuals.

Main Methods:

  • Exploration of neuropsychological syndromes (e.g., blindsight, visual form agnosia, optic ataxia, neglect).
  • Application of experimental psychology paradigms in healthy individuals.
  • Utilization of functional brain-imaging tools.

Main Results:

  • Neuropsychological syndromes provide critical data for understanding visual consciousness.
  • Findings from syndromes like blindsight and neglect are explainable by the global workspace model.
  • Principles derived from patient studies are validated in healthy individuals.

Conclusions:

  • The study's results impose constraints on neural theories of consciousness.
  • Findings are crucial for clinicians managing complex neurovisual disorders.
  • The global workspace model provides a framework for understanding these dissociations.