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Pedestal effect in visual motion discrimination

W A Simpson1, B A Finsten

  • 1Department of Psychology, University of Winnipeg, Manitoba, Canada.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|December 1, 1995
PubMed
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Sensory speed discrimination typically worsens with larger stimuli. However, this study found a "pedestal effect" where discrimination improves with larger jumps, challenging existing models and suggesting a new speed energy model.

Area of Science:

  • Visual perception
  • Psychophysics
  • Sensory neuroscience

Background:

  • Sensory discriminations, like speed discrimination, often follow Weber's law, becoming harder with larger stimuli.
  • Previous models suggested a speed energy model for detecting jump pairs.

Purpose of the Study:

  • To investigate the effect of jump size on motion displacement discrimination.
  • To test the validity of the speed energy model and explore nonlinearities in visual processing.

Main Methods:

  • Utilizing one-jump apparent motion stimuli.
  • Analyzing displacement discrimination performance across various jump sizes, including those near and below the detection threshold.

Main Results:

  • A "pedestal effect" was observed: displacement discrimination improved with larger jumps for small jump sizes.

Related Experiment Videos

  • Masking occurred for sufficiently large jumps, where discriminability declined.
  • These results indicate a squaring nonlinearity for small speed signals and linear transduction for large signals.

    • Conclusions:

    • The findings support a speed energy model incorporating a half-wave rectification nonlinearity.
    • The visual system's processing of speed signals transitions from nonlinear to linear with increasing signal magnitude.
    • This challenges the universal applicability of Weber's law in speed discrimination under certain conditions.