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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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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Interactions between perception and action programming: evidence from visual extinction and optic ataxia.

Keiko Kitadono1, Glyn W Humphreys

  • 1Behavioural Brain Sciences, School of Psychology, University of Birmingham, Birmingham, UK.

Cognitive Neuropsychology
|December 11, 2007
PubMed
Summary

Action programming significantly impacts visual perception in patients with extinction. For pure extinction, programming actions to the affected side worsens deficits, while programming to the unaffected side improves performance.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual extinction and optic ataxia are distinct neurological conditions affecting spatial awareness and visually guided actions.
  • Understanding the interplay between perception and action is crucial for developing effective rehabilitation strategies.

Purpose of the Study:

  • To investigate how action programming interacts with visual perception in patients with visual extinction and optic ataxia.
  • To differentiate the effects of action programming on perception in pure extinction versus extinction with optic ataxia.

Main Methods:

  • Seven experiments were conducted involving patients with visual extinction and optic ataxia.
  • Participants performed pointing responses to visual stimuli while identifying shapes.
  • Action programming (pointing direction, hand used) was manipulated to assess its effect on perceptual accuracy.

Main Results:

  • Patients with pure extinction showed increased extinction when programming actions to the ipsilesional side, which was ameliorated by programming actions to the contralesional side.
  • Optic ataxic patients exhibited increased extinction with action programming, particularly for peripheral stimuli, suggesting resource depletion.
  • These effects were observed even when visual stimuli were presented well before action execution.

Conclusions:

  • Action programming profoundly influences visual perception, with distinct patterns observed in pure extinction versus optic ataxia.
  • In pure extinction, attention coupling to action endpoints modulates deficits.
  • In optic ataxia, action programming can exacerbate spatial deficits by consuming perceptual resources, impacting models of perception and action.