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Second-order orientation cues to the axis of motion.
David R Badcock1, J Edwin Dickinson
1School of Psychology, The University of Western Australia, Crawley, WA, Australia. david@psy.uwa.edu.au
Vision Research
|December 17, 2008
Summary
Motion streaks, generated by image smear, indicate motion direction. Second-order texture cues, not just smear, effectively signal motion axis and coherence, supporting existing models.
Area of Science:
- Visual perception
- Neuroscience
- Computational vision
Background:
- Geisler's model proposes motion streaks from image smear indicate motion direction.
- Extended integration periods in Simple cells are thought to create these motion streaks.
Purpose of the Study:
- To investigate if second-order texture cues can signal motion axis and coherence.
- To test the role of extended contours in perceived motion direction.
Main Methods:
- Used textured dot-pairs with luminance increments/decrements.
- These contours had the same average luminance as the background.
- Contours were designed to be incompatible with smear-induced cues.
Main Results:
- Textured contours were equally effective in signaling motion axis and coherence.
- Results support the role of extended contours in determining perceived motion axis.
- The visual system can utilize second-order texture cues for motion perception.
Conclusions:
- Extended contours are crucial for determining the perceived axis of motion.
- Second-order texture cues are viable inputs for motion processing models.
- Findings support Geisler's (1999) and Barlow & Olshausen's (2004) models.
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