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Implicit redundant-targets effect in visual extinction

C A Marzi1, N Smania, M C Martini

  • 1Dipartimento di Scienze Neurologische e della Visione-Sezione di Fisiologia, University of Verona, Italy.

Neuropsychologia
|January 1, 1996
PubMed
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Patients with visual extinction, a condition from right hemisphere damage, still show a redundant targets effect (RTE). This suggests processing of ignored visual stimuli occurs, supporting neural coactivation models.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Unilateral right hemisphere damage can cause left visual extinction, where patients fail to perceive stimuli in their left visual field.
  • The redundant targets effect (RTE) is a phenomenon where reaction times are faster to bilateral stimuli compared to unilateral stimuli.

Purpose of the Study:

  • To investigate whether patients with visual extinction exhibit a redundant targets effect (RTE).
  • To explore the underlying neural mechanisms of the RTE in extinction patients, differentiating between coactivation and probabilistic models.

Main Methods:

  • Patients with left visual extinction underwent testing using a redundant targets effect (RTE) paradigm.
  • Brief, lateralized or bilateral LED flashes were presented, and participants responded by pressing a key and reporting stimulus count.

Related Experiment Videos

  • Reaction times to unilateral and bilateral stimuli were recorded and analyzed.

    • Main Results:

    • Extinction patients demonstrated a significant RTE, responding faster to bilateral stimuli than unilateral ones.
    • The RTE was observed even when stimuli in the contralesional (left) hemifield were extinguished.
    • The magnitude of the redundant targets effect in extinction patients aligned with a coactivation model, not a probabilistic one.

    Conclusions:

    • Visual extinction patients retain some level of processing for ignored, contralesional stimuli.
    • The redundant targets effect in extinction suggests preserved early sensory processing and interaction between visual inputs.
    • Findings support a neural coactivation model for the redundant targets effect in this patient group.