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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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A Brücke-Bartley effect for contrast.

Joshua A Solomon1, Christopher W Tyler1

  • 1Centre for Applied Vision Research, City, University of London, London EC1V 0HB, UK.

Royal Society Open Science
|September 19, 2018
PubMed
Summary
This summary is machine-generated.

Apparent contrast perception increases with flickering physical contrast. This study reveals an expansive transduction of contrast, similar to how flickering light enhances perceived brightness.

Keywords:
apparent contrastbrightnessflickerpsychophysical functiontransducer function

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Area of Science:

  • Visual perception
  • Psychophysics
  • Sensory neuroscience

Background:

  • Deriving the psychophysical (transducer) function requires understanding intensity mean-variance relationships or using average estimates between discriminable stimuli.
  • Estimates of average intensity can be variable and influenced by cognitive rather than sensory processes.

Purpose of the Study:

  • To minimize cognitive bias in psychophysical function derivation.
  • To investigate the relationship between physical contrast, carrier frequency, and perceived contrast.

Main Methods:

  • Utilized amplitude-modulated contrast to reduce cognitive pollution in intensity perception studies.
  • Measured observer estimates of average intensity across varying spatial and temporal carrier frequencies.

Main Results:

  • Estimates of average intensity showed decreased variability across observers as carrier frequency increased.
  • Perceived contrast estimates converged towards mean power (contrast squared) rather than mean contrast.
  • Apparent contrast perception is enhanced by flickering physical contrast.

Conclusions:

  • Flickering contrast leads to an expansive transduction of perceived contrast, analogous to Brücke's finding for luminance.
  • This suggests a non-linear sensory processing of contrast information.