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Published on: April 14, 2020
Orientation anisotropy in the Ternus phenomenon
1Department of Psychology, Ripon College, P.O. Box 248, Ripon, WI 54971, USA. petersikt@ripon.edu
Perceptual and Motor Skills
|June 24, 2009
Summary
The Ternus display
Area of Science:
- Visual perception
- Psychophysics
- Cognitive psychology
Background:
- The Ternus display presents ambiguous apparent movement.
- It can be perceived as either group movement or element movement.
Purpose of the Study:
- To investigate how retinal eccentricity and element orientation influence Ternus display perception.
- To determine the effect on group-movement reports.
Main Methods:
- Six participants viewed 48 variations of the Ternus display.
- Each variation was replicated 100 times.
- Participants reported perceived movement type (group vs. element).
Main Results:
- Retinal eccentricity did not affect Ternus display perception.
- Oblique and vertical element orientations increased group-movement reports compared to horizontal.
- This effect was consistent across most interstimulus intervals.
Conclusions:
- Perception of Ternus apparent movement is not influenced by retinal eccentricity.
- An orientational anisotropy exists in Ternus display processing.
- Element organization significantly impacts whether group or element movement is perceived.
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