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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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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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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.
Once through the pupil, the light passes through the lens, a...
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Related Experiment Video

Updated: Apr 26, 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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Higher cortical visual deficits.

Jason J S Barton

    Continuum (Minneapolis, Minn.)
    |August 8, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Visual dysfunction beyond the striate cortex includes color and motion perception issues. Lesions in occipitotemporal or occipitoparietal lobes cause object recognition or spatial localization problems.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Cognitive Psychology

    Background:

    • This review examines visual dysfunctions arising from lesions outside the primary visual cortex (striate cortex).
    • It focuses on higher-level visual processing areas within the brain.

    Observation:

    • Dysfunctions include impaired color constancy (dyschromatopsia), prosopagnosia (face recognition deficits) linked to occipitotemporal lesions, and pure alexia (reading deficits) potentially with dysgraphia.
    • Developmental topographic disorientation and Balint syndrome, characterized by attention deficits and spatial/temporal disorientation, are also discussed.

    Findings:

    • Lesions in intermediate visual processing hierarchies can impair color and motion perception.
    • Ventral occipitotemporal lesions lead to object recognition deficits.
    • Dorsal occipitoparietal lesions result in difficulties with spatial localization and guidance.

    Implications:

    • Understanding these specific deficits aids in diagnosing and localizing brain lesions.
    • This knowledge is crucial for developing targeted rehabilitation strategies for patients with visual processing disorders.
    • Further research can refine the understanding of the visual processing hierarchy and its clinical manifestations.