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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
11:17

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Published on: August 24, 2012

Visual extinction and stimulus repetition.

G C Baylis1, J Driver, R D Rafal

  • 1University of California, San Diego.

Journal of Cognitive Neuroscience
|August 23, 2013
PubMed
Summary
This summary is machine-generated.

Patients with visual extinction after brain injury struggle to report stimuli on their affected side. Extinction worsens with identical stimuli, suggesting visual processing occurs even without conscious report.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual extinction is a deficit where patients fail to perceive a stimulus in one visual field when another stimulus is present simultaneously.
  • This condition often results from unilateral brain injury, particularly affecting parietal or frontal lobes.

Purpose of the Study:

  • To investigate the nature of visual processing in patients with visual extinction.
  • To determine how stimulus similarity affects the manifestation of visual extinction.
  • To explore the underlying mechanisms of visual extinction, potentially linking it to attentional or representational processes.

Main Methods:

  • Five patients with visual extinction underwent visual testing with briefly presented colored letters.
  • Stimuli were presented in one or both visual fields, requiring patients to report and locate colors or shapes.
  • The effect of stimulus similarity on the same or irrelevant dimensions was analyzed during simultaneous stimulation.

Main Results:

  • Patients with visual extinction frequently missed stimuli contralateral to their brain lesion during double simultaneous stimulation.
  • This extinction phenomenon was exacerbated when stimuli shared the same relevant feature (e.g., color or shape).
  • Similarity in irrelevant dimensions did not influence the degree of extinction.

Conclusions:

  • Visual information, such as colors and shapes, can be processed by the visual system even when it is not available for verbal report in patients with extinction.
  • Extinction may stem from a failure in token-individuation, a process crucial for distinguishing individual visual items, rather than a complete failure of visual extraction.
  • The findings suggest a dissociation between visual perception and conscious report in the context of visual extinction, drawing parallels with repetition blindness in healthy individuals.