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Related Experiment Videos

Spatial consequences of bridging the saccadic gap.

Kielan Yarrow1, Louise Whiteley, John C Rothwell

  • 1Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, UCL, UK. k.yarrow@ion.ucl.ac.uk

Vision Research
|July 12, 2005
PubMed
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Conscious perception actively revises sensory input, even after the event. This study shows visual illusions after eye movements (saccades) are adjusted to maintain a coherent, though not perfectly accurate, experience.

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Conscious perception is not a passive reception of sensory data.
  • Eye movements, or saccades, create brief visual disruptions.
  • Previous research suggests the brain may 'fill in' missing visual information during saccades.

Purpose of the Study:

  • To investigate how conscious perception is actively redrafted by the brain.
  • To examine the effects of saccades on the perception of time, velocity, and distance for moving objects.
  • To determine if post-saccadic adjustments resolve discrepancies in perceived motion.

Main Methods:

  • Six experiments were conducted involving visual stimuli and observer eye movements (saccades).
  • Observers viewed stationary and moving objects before and after saccades.

Related Experiment Videos

  • Perceived duration, position, and motion of stimuli were measured.

    • Main Results:

    • The saccadic illusion of overestimating duration extends to moving objects, creating discrepancies in perceived time, velocity, and distance.
    • This discrepancy is partially resolved within 500 ms post-saccade.
    • Post-saccadic stimuli showed greater forward mislocalization after a saccade compared to pursuit alone.

    Conclusions:

    • Conscious perception actively reconstructs visual events, incorporating information before and after the event.
    • The brain adjusts post-saccadic perception to create a coherent gist of visual experience, even at the cost of detailed accuracy.
    • Visual perception dynamically integrates saccadic information with subsequent sensory input to resolve temporal and spatial discrepancies.