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Related Concept Videos

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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Motor and Sensory Areas of the Cortex01:14

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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.
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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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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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.
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Related Experiment Video

Updated: Jan 6, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Higher Cortical Visual Disorders.

Sashank Prasad, Marc Dinkin

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    Summary
    This summary is machine-generated.

    This review explores higher visual processing disorders caused by damage to extrastriate cortex. Understanding these brain regions aids in diagnosing and managing visual processing deficits.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Cognitive Science

    Background:

    • Extrastriate regions of the cerebral cortex are crucial for higher visual processing.
    • Disruptions in these areas lead to specific visual processing disorders.

    Observation:

    • Lesion studies have illuminated the roles of specific cortical regions in functions like facial recognition and reading.
    • Modern neuroimaging, including functional MRI (fMRI), has further characterized the functions of ventral and dorsal visual streams.
    • Network-based imaging studies are revealing mechanisms behind visual hallucinations.

    Findings:

    • Analysis of lesion consequences and advanced imaging techniques have refined our understanding of visual processing networks.
    • fMRI has identified distinct roles for ventral regions in object recognition and dorsal regions in motion perception and visuospatial attention.
    • Recent studies explore the neural underpinnings of spontaneous visual hallucinations.

    Implications:

    • Knowledge of higher-order visual processing regions and networks is essential for clinical neurology.
    • This understanding aids in diagnosing and managing visual processing disorders.
    • It also facilitates the identification and treatment of underlying neurological diseases affecting vision.