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Related Experiment Videos

Blindsight in monkeys

A Cowey1, P Stoerig

  • 1Department of Experimental Psychology, Oxford University, UK.

Nature
|January 19, 1995
PubMed
Summary
This summary is machine-generated.

Monkeys with visual cortex lesions exhibit blindsight, responding to stimuli in their blind fields without conscious awareness. This suggests they, like human patients, possess blindsight rather than degraded vision.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Vision Research

Background:

  • Blindsight involves visually evoked responses in patients with striate cortex destruction despite phenomenal blindness.
  • Extra-geniculostriate pathways are hypothesized to mediate blindsight.
  • Monkeys with primary visual cortex lesions can detect and localize stimuli in their visual field defects.

Purpose of the Study:

  • To determine if monkeys with visual cortex lesions experience blindsight or degraded vision.
  • To investigate the subjective experience of visual stimuli in monkeys with induced visual field defects.

Main Methods:

  • Monkeys with excellent visual stimulus detection were tested using a signal-detection task.
  • The task included blank trials (no stimulus) alongside trials with visual stimuli.

Related Experiment Videos

  • Monkeys classified stimuli presented in their visual field defects.

    • Main Results:

    • Monkeys classified visual stimuli in their defective visual fields as blank trials.
    • This behavior mirrors that of human blindsight patients.
    • The findings suggest an absence of phenomenal vision in the affected field.

    Conclusions:

    • Monkeys with primary visual cortex lesions demonstrate blindsight.
    • This challenges the notion of degraded real vision in such cases.
    • The study provides evidence for blindsight in non-human primates, supporting its neural basis.