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Conditional spatial-frequency selective pooling of one-dimensional motion signals into global two-dimensional motion
Kazushi Maruya1, Kaoru Amano, Shin'ya Nishida
1NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morinosato Wakamiya Atsugi-shi, Kanagawa, Japan. Kazushi.Maruya@gmail.com
Vision Research
|April 1, 2010
Summary
Perception of global motion relies on integrating local motion signals. This integration, or motion pooling, is hindered by spatial-frequency differences but facilitated by form cues like closed contours.
Area of Science:
- Visual perception
- Computational neuroscience
Background:
- Local motion signals are integrated into global motion perception.
- Spatial-frequency differences can affect this motion-pooling process.
Purpose of the Study:
- To investigate how spatial-frequency differences influence motion pooling.
- To determine the role of form information in overcoming spatial-frequency disparities during motion integration.
Main Methods:
- Utilized Gabor elements with varying spatial frequencies and envelope shapes.
- Examined motion pooling under conditions with circular envelopes and reduced high-frequency element widths forming closed contours.
Main Results:
- Motion pooling was significantly impaired with two- to three-octave spatial-frequency differences when elements had circular envelopes.
- Pooling became possible when high-frequency element widths were reduced, creating a closed contour configuration.
Conclusions:
- Motion pooling is strongly influenced by form information, not solely spatial frequency.
- Spatial-frequency difference is a segmentation cue, but its effect can be modulated by overall stimulus form.
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