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Related Experiment Videos

Visual detection in monkeys with blindsight

A Cowey1, P Stoerig

  • 1Department of Experimental Psychology, University of Oxford, U.K.

Neuropsychologia
|July 1, 1997
PubMed
Summary
This summary is machine-generated.

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Monkeys with striate cortex removal exhibit blindsight, responding to visual stimuli without conscious awareness. This suggests a loss of phenomenal vision, similar to human blindsight patients.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Unilateral striate cortical removal in monkeys results in residual visual abilities.
  • The study investigates whether these monkeys, like human blindsight patients, lack phenomenal representation of visual stimuli.

Purpose of the Study:

  • To determine if monkeys with striate cortical lesions exhibit blindsight.
  • To compare the visual categorization abilities in the impaired hemifield with those in the normal hemifield.

Main Methods:

  • Assessed visual sensitivity by varying stimulus luminance.
  • Conducted two tests: one for stimulus categorization (one vs. two lights) and another for stimulus detection (light vs. blank trial).

Main Results:

Related Experiment Videos

  • Visual sensitivity was reduced in the impaired hemifield.
  • Monkeys ignored stimuli in the impaired field during categorization tasks.
  • Monkeys responded to suprathreshold stimuli in the impaired field as if they were blank trials.

Conclusions:

  • Monkeys with striate cortical destruction demonstrate blindsight for brief static visual targets.
  • These findings suggest a loss of phenomenal vision in the affected hemifield, mirroring human blindsight conditions.