Motion Aftereffects From Moving Illusions.

Stuart Anstis

doi:10.1177/2041669518811305

Abstract

Lines in the café wall illusion, and motion trajectories in the furrow illusion, appear to be tilted away from their true orientations. We adapted to moving versions of both illusions and found that the resulting motion aftereffects were appropriate to their perceptual, not their physical, orientations.

Highlights

We examined two geometrical illusions, one normally static and the other one moving
We adapted to a moving version of the cafewall illusion and stopped the motion
We found a strong aftereffect of motion, when the motion was stopped the horizontal lines immediately above and below the fixation point appeared to expand outward

Summary

Introduction

We examined two geometrical illusions, one normally static and the other one moving. In the static cafewall illusion (Gregory, 1979; Munsterberg, 1897), horizontal lines appear to be tilted away from the horizontal. In the static cafewall illusion (Gregory, 1979; Munsterberg, 1897), horizontal lines appear to be tilted away from the horizontal. In the moving furrow illusion (Anstis, 2012), the vertical trajectory of a downward-moving spot appears to be tilted away from the vertical.

Results

Conclusion