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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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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Related Experiment Video

Updated: Apr 10, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Macaque monkeys experience visual crowding.

Erin A Crowder, Carl R Olson

    Journal of Vision
    |June 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Rhesus macaque monkeys exhibit crowding, a visual phenomenon where clutter impairs object discrimination. This finding enables neuronal studies of crowding in the primate visual system.

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    Area of Science:

    • Neuroscience
    • Visual Perception
    • Comparative Psychology

    Background:

    • Crowding, where visual clutter impairs object discrimination, is well-documented in humans.
    • The neural basis of crowding remains poorly understood, hindering further research.
    • Previous crowding studies were limited to humans, preventing neuronal investigations.

    Purpose of the Study:

    • To determine if crowding occurs in rhesus macaque monkeys.
    • To establish a foundation for future single-neuron recording studies of crowding.
    • To investigate the behavioral hallmarks of crowding in a nonhuman primate model.

    Main Methods:

    • Monkeys were trained to identify a target letter amidst flanking distractors.
    • Target recognition accuracy was measured at varying target-flanker spacings and eccentricities.
    • The critical spacing for reliable discrimination was analyzed in relation to eccentricity and object size.

    Main Results:

    • Rhesus macaques demonstrated three key characteristics of crowding observed in humans.
    • Increased target-flanker spacing improved recognition accuracy.
    • Critical spacing was proportional to visual eccentricity and largely independent of object size.

    Conclusions:

    • Rhesus macaque monkeys exhibit crowding, mirroring human visual perception.
    • This study validates the use of macaques for investigating the neural mechanisms of crowding.
    • The findings pave the way for in-depth neuronal analyses of visual crowding in primates.