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Related Experiment Videos

Stimulus cueing in blindsight.

Alan Cowey1, Petra Stoerig

  • 1Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, UK. Alan.Cowey@psy.ox.ac.uk

Progress in Brain Research
|December 4, 2003
PubMed
Summary
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Stimulus uncertainty impairs blindsight performance in monkeys and humans. Attention plays a key role in blindsight, as performance decreased when visual stimuli were unpredictable.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Blindsight describes the ability to respond to visual stimuli in a cortically blind field.
  • Previous blindsight studies often provided subjects with predictable stimulus timing.

Purpose of the Study:

  • To investigate the impact of stimulus uncertainty on blindsight responses.
  • To explore the role of attention in blindsight.

Main Methods:

  • Four hemianopic monkeys and one human hemianope participated.
  • Stimulus presentation was either self-triggered (certainty) or delayed after a start-light cue (uncertainty).
  • Performance was measured by response rate and accuracy.

Main Results:

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  • Stimulus uncertainty significantly reduced both the percentage of trials responded to and the percentage correct.
  • Performance decrements were particularly notable in monkeys.
  • Localization accuracy remained significant in most subjects despite uncertainty.

    • Conclusions:

    • Attention significantly influences blindsight performance.
    • Uncertainty and delayed cueing impair visual processing in blindsight.
    • Blindsight capabilities persist even under conditions of reduced attention and stimulus predictability.