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Visual extinction with double simultaneous stimulation: what is simultaneous?

Gordon C Baylis1, Stephanie L Simon, Leslie L Baylis

  • 1Presbyterian College, Clinton, SC 29325, USA. gordon@sc.edu

Neuropsychologia
|March 20, 2002
PubMed
Summary
This summary is machine-generated.

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Patients with parietal lobe lesions causing extinction showed maximal extinction when stimuli were simultaneous. However, they needed a significant temporal lead for contralesional stimuli to be perceived first, challenging current extinction models.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Unilateral parietal lobe lesions can cause visual extinction, a deficit where patients fail to perceive a stimulus in one visual field when presented simultaneously with another.
  • Previous research indicates extinction is maximal under simultaneous visual presentation.

Purpose of the Study:

  • To investigate the temporal dynamics of visual extinction.
  • To reconcile seemingly paradoxical findings regarding stimulus competition and temporal order judgments in extinction patients.

Main Methods:

  • Patients with unilateral parietal lesions and extinction performed two tasks: stimulus identification and temporal order judgment.
  • Stimuli were presented either simultaneously or with slight temporal onsets (contralesional or ipsilesional lead).

Related Experiment Videos

Main Results:

  • Maximal extinction occurred when stimuli were physically simultaneous during identification.
  • Patients required a significant contralesional lead for stimuli to be perceived as occurring first, contradicting the maximal competition at simultaneity.

Conclusions:

  • Findings present a paradox: extinction is maximal at simultaneity for identification, yet simultaneity is not phenomenally special for temporal order.
  • Current models of extinction may need revision to account for these temporal processing discrepancies.