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Do component motions recombine into a moving plaid percept?
A V van den Berg1, W A van de Grind
1Fysiologie 1, Erasmus University Rotterdam, Faculty of Medicine, The Netherlands.
Experimental Brain Research
|January 1, 1993
Summary
Adding texture to moving gratings changes plaid motion perception. Fine textures lead to coherent plaid perception, but plaid direction is independent of component motion, challenging existing models.
Area of Science:
- Visual perception
- Neuroscience
- Computational vision
Background:
- Coherent plaid motion arises from superimposed, independently moving gratings.
- Texture addition can disambiguate component grating motion.
Purpose of the Study:
- Investigate how adding texture to component gratings affects plaid motion perception.
- Test the validity of the two-stage model of motion perception.
Main Methods:
- Subjects viewed superimposed, textured gratings with differing orientations and independent motion.
- Texture detail size (1, 2, 4 min of arc) was varied.
- Perceived plaid motion direction and coherence were recorded.
Main Results:
- Fine textures (1 min arc) resulted in coherent plaid perception, but plaid direction was independent of component motion.
- Coarser textures (2, 4 min arc) led to perception of sliding gratings.
- Plaid perception decreased with longer sequences, wider bars, and texture intersections.
Conclusions:
- Results challenge the Adelson and Movshon (1982) two-stage model.
- Data support a model with orientation-selective first-stage detectors and cross-orientation combination in the second stage.
- This revised model better explains coherent and transparent plaid motion perception.