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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
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Asynchronous stimulus presentation in visual extinction: a psychophysical study.

Sarah Geeraerts1, Christophe Lafosse, Erik Vandenbussche

  • 1Laboratory of Neuropsychology, University of Leuven, Belgium.

Journal of Neuropsychology
|March 2, 2010
PubMed
Summary
This summary is machine-generated.

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Visual extinction in brain-lesioned patients is complex. Varying stimulus timing revealed distinct patient responses, suggesting diverse underlying neural mechanisms for this visual processing deficit.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Visual extinction occurs in patients with unilateral brain lesions.
  • These patients fail to perceive contralesional stimuli with simultaneous ipsilesional stimuli.

Purpose of the Study:

  • Investigate the nature of the deficit in visual extinction.
  • Examine the impact of stimulus onset asynchrony on visual extinction in neglect patients.

Main Methods:

  • Used a psychophysical paradigm with varying stimulus onset asynchronies.
  • Determined contrast thresholds for a target grating in neglect patients (N=10).
  • Presented target and distractor stimuli in different hemifields.

Main Results:

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  • Simultaneous presentation caused significant extinction effect in neglect patients.
  • When distractor preceded target by 250 ms, five patients improved, five showed increased extinction.
  • Observed two distinct patterns of results based on stimulus timing.

    • Conclusions:

    • Visual extinction in neglect patients may stem from different underlying mechanisms.
    • Lesion location might influence the manifestation of visual extinction.
    • Temporal dynamics of stimulus presentation are crucial for understanding visual extinction.