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Propagation of local motion correspondence
1Department of Industrial Management Systems Engineering, Arizona State University, Tempe 85287-5906, USA.
Vision Research
|October 1, 1995
Summary
Motion perception is influenced by surrounding visual elements. Our study shows how apparent motion direction can propagate across a scene, affecting perceived motion, especially with longer viewing durations.
Area of Science:
- Visual perception
- Motion perception
- Computational neuroscience
Background:
- The perception of motion direction is complex and can be influenced by contextual factors.
- The proximity rule suggests that elements close together are perceived as a group, influencing motion interpretation.
Purpose of the Study:
- To investigate how apparent motion direction in one part of a visual scene constrains motion perception in other parts.
- To explore the influence of frame duration and occluders on motion correspondence signals.
Main Methods:
- Subjects viewed an array of dots moving in a consistent physical direction.
- Frame duration and the presence of occluding objects were systematically varied.
- Perceived motion direction (rightward vs. oscillation) was recorded for central and edge regions.
Main Results:
- Longer frame durations led to perceived oscillation in the array's interior, contrary to the proximity rule.
- Shorter frame durations increased the likelihood of perceiving rightward motion centrally.
- Oscillation was consistently observed at the edges, irrespective of frame duration.
- Occluders eliminated central oscillation, promoting perceived rightward motion throughout.
- Perceptual effects were consistent across foveal and peripheral viewing conditions.
Conclusions:
- Motion correspondence signals, like oscillation, can propagate over significant visual distances (up to ~30 deg/sec).
- These findings support a locally-connected iterative network model for explaining motion perception phenomena.