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Related Experiment Videos

Flicker distorts visual space constancy.

S L Macknik1, B D Fisher, B Bridgeman

  • 1Psychology Board of Studies, Kerr Hall UCSC 95064.

Vision Research
|January 1, 1991
PubMed
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Flickering targets during eye movements distort space perception. Lower flicker rates made displacements easier to detect, suggesting flicker impacts visual processing and space constancy.

Area of Science:

  • Visual perception
  • Neuroscience
  • Human factors

Background:

  • Space constancy, the perception of a stable external world, is challenged during saccadic eye movements.
  • Visual masking and extraretinal signals are thought to suppress the perception of visual displacement during saccades.

Purpose of the Study:

  • To investigate the effects of target flicker frequency on the perception of spatial displacement during saccadic eye movements.
  • To determine how flicker influences the detectability of target displacements relative to eye movement direction.

Main Methods:

  • Participants performed a 2-interval forced-choice task to detect target displacements.
  • A small target was flickered at frequencies of 33, 66, 130, or 260 Hz during saccades.
  • Target displacement was tested in the direction of and opposite to eye movement.

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Main Results:

  • Displacement detection sensitivity was approximately twice as high when the target moved opposite to the eye movement compared to the same direction.
  • Lower flicker rates (33 and 66 Hz) resulted in greater displacement detectability than higher rates.
  • Detection was easier when the imposed displacement added to the expected illusory displacement during saccades.

Conclusions:

  • Flicker significantly affects space perception and the detectability of spatial displacements during saccades.
  • Both visual masking and extraretinal signals play crucial roles in suppressing displacement detection.
  • Flicker, particularly at lower frequencies, may distort perceived space and impact visual stability, with implications for video display terminal use.