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Prime-sight and blindsight.

L Weiskrantz1

  • 1Brain and Cognition Laboratory, Department of Experimental Psychology, University of Oxford, South Parks Rd, OX1 3UD Oxford, UK. weiskran@psy.ox.ac.uk

Consciousness and Cognition
|December 10, 2002
PubMed
Summary
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Blindsight patient DB experiences conscious after-images from stimuli he cannot consciously perceive. This discovery allows comparing brain activity for conscious and unconscious perception of the same visual stimuli.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Studies on blindsight, a condition where individuals with visual cortex damage can respond to visual stimuli they do not consciously see.
  • Subject DB, the first extensively studied blindsight patient, has undergone re-testing after 17 years.

Observation:

  • Subject DB demonstrates retained or enhanced visual discrimination abilities.
  • A novel finding is DB's report of conscious after-images from a wide range of stimuli presented unconsciously.

Findings:

  • These after-images exhibit properties such as occurring after unseen color patches and luminance changes, having long durations, and showing inter-ocular transfer.
  • The after-images conform to Emmert's Law and are explored in relation to stimuli presented to both eyes and imagined after-images in sighted individuals.

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Implications:

  • This unique case provides a rare opportunity to directly compare neural activity associated with conscious and unconscious attributes of identical stimuli.
  • Facilitates understanding the neural basis of consciousness and visual processing in blindsight.