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Measuring the double-drift illusion and its resets with hand trajectories
Bernard Marius 't Hart1,2, Denise Y P Henriques1,3, Patrick Cavanagh1,4,5
1Centre for Vision Research, York University, Toronto, Ontario, Canada.
Journal of Vision
|February 23, 2022
Summary
This study on visual motion illusion shows that manual tracking accurately measures perceived Gabor path deviation. The illusion resets randomly, suggesting external factors like distractions influence perception.
Area of Science:
- Visual perception
- Motion perception
- Psychophysics
Background:
- Gabor patterns with orthogonal internal texture drift create a compelling illusion of motion deviation.
- Previous studies used perceptual and pointing measures to quantify this illusion.
Purpose of the Study:
- To validate manual tracking as a reliable method for measuring the Gabor motion illusion.
- To investigate the breakdown and reset dynamics of the illusion in single trials.
Main Methods:
- Manual tracking of a Gabor pattern's perceived trajectory using a stylus on a drawing tablet.
- Post-stimulus drawing of the perceived Gabor path to analyze deviation and resets.
- Statistical analysis of reset distribution using a gamma distribution model.
Main Results:
- Manual tracking magnitude closely matched previous measures, validating its use.
- The Gabor illusion deviation stops accumulating and either plateaus or resets.
- Illusion resets occur randomly, approximately every 1.3 seconds, fitting a gamma distribution.
Conclusions:
- Manual tracking is a valid and effective method for studying the Gabor motion illusion.
- Illusion resets are not limited by time or space but are randomly triggered, possibly by distractions or eye movements.
