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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"...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

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Related Experiment Video

Updated: Jun 7, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Visual selection and action in Balint's syndrome.

Martin G Edwards, Glyn W Humphreys

    Cognitive Neuropsychology
    |October 20, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Attention and action are linked, as shown in a Balint's syndrome patient. Visual selection deficits impacted coordinated actions, but grouping stimuli improved performance.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Visual Perception

    Background:

    • Balint's syndrome is a rare neuropsychological disorder.
    • It results from bilateral parietal lobe damage.
    • It impairs visual attention, spatial orientation, and visually guided actions.

    Purpose of the Study:

    • To investigate the relationship between attention and action in Balint's syndrome.
    • To explore how visual selection processes influence coordinated movements.
    • To compare action and detection performance in extinction paradigms.

    Main Methods:

    • Case study of a patient (GK) with Balint's syndrome.
    • Experiments with prolonged and reduced stimulus exposures.
    • Assessment of bimanual actions and stimulus detection.

    Main Results:

    • Patient GK showed independent actions to bilateral stimuli, unlike controls.
    • Bimanual actions to single stimuli were temporally coordinated.
    • Visual extinction affected both detection and action similarly.
    • Stimulus grouping (collinearity, contrast) and proximity improved bimanual coordination.

    Conclusions:

    • Visual selection processes play a crucial role in both perception and action.
    • Deficits in attention significantly impact the ability to perform coordinated actions.
    • Understanding these links offers insights into neurological disorders affecting vision and motor control.