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Flicker-Defined Forms in the Ternus Display.

Molly R Silva1, J Timothy Petersik2

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The Ternus display

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Area of Science:

  • Visual perception
  • Psychophysics
  • Computational neuroscience

Background:

  • The Ternus display is a classic psychophysical stimulus used to study motion perception.
  • Odic and Pratt (2008) proposed that temporal summation of contrast influences perceived motion in bistable Ternus displays.

Purpose of the Study:

  • To investigate whether temporal summation of contrast affects perceived motion (group vs. end-to-end movement) in flicker-defined Ternus displays.
  • To test the predictions of Odic and Pratt (2008) regarding the role of temporal summation of contrast.

Main Methods:

  • Participants viewed flicker-defined and luminance-defined Ternus displays.
  • Interstimulus intervals (ISIs) of 0–80 ms and stimulus durations (SDs) of 200–400 ms were manipulated.
  • The frequency of perceived group and end-to-end movement reports was recorded in each condition.

Main Results:

  • No significant main effect of display condition (flicker-defined vs. luminance-defined) was found.
  • Participants reported both group and end-to-end movement percepts at expected rates in both conditions.
  • The results contradicted the predictions of Odic and Pratt (2008).

Conclusions:

  • Temporal summation of contrast does not appear to influence perceived motion in flicker-defined Ternus displays.
  • The findings challenge the theory that temporal summation of contrast is the primary determinant of motion perception in bistable Ternus displays.