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Related Concept Videos

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"...
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Vision01:24

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Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Neuroplasticity01:01

Neuroplasticity

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Related Experiment Video

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Lexical recovery from extinction: Interactions between visual form and stored knowledge modulate visual selection.

T Kumada, G W Humphreys

    Cognitive Neuropsychology
    |October 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Lexical knowledge improves visual identification of letters within words, even with extinction. This word superiority effect is modulated by letter case and visual grouping factors.

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    Area of Science:

    • Cognitive Neuroscience
    • Visual Perception
    • Neuropsychology

    Background:

    • Extinction is a deficit in attention where stimuli in one visual field are ignored when presented with competing stimuli.
    • Lexical knowledge, or familiarity with words, can influence visual processing.
    • Patients with parietal lesions often exhibit extinction.

    Purpose of the Study:

    • To investigate the impact of lexical knowledge on visual extinction.
    • To determine if word familiarity affects the identification of letters in extinction.
    • To explore how visual grouping and letter case modulate these effects.

    Main Methods:

    • A patient (GK) with bilateral parietal lesions and left extinction was tested.
    • Letters forming words or nonwords were presented bilaterally under simultaneous stimulation.
    • Tasks included letter identification and detection under varying conditions of grouping and letter case.

    Main Results:

    • A word superiority effect was observed in identification, with better left-side letter recognition in words than nonwords, even during extinction.
    • This effect was larger for lowercase than uppercase words.
    • No word superiority effect was found in detection tasks when low-level grouping was strong, but it re-emerged when grouping was reduced.

    Conclusions:

    • Lexical knowledge can modulate visual selection, enhancing letter identification within words even under extinction conditions.
    • Visual selection is influenced by both high-level factors (lexical knowledge) and low-level perceptual grouping.
    • Familiarity and stored knowledge play a role in overcoming attentional deficits in visual processing.