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Contrasting the processes of texture segmentation and discrimination with static and phase-reversing stimuli
L J Norman1, C A Heywood, R W Kentridge
1Department of Psychology, University of Durham, Durham DH1 3LE, United Kingdom. liam.norman@dur.ac.uk
Vision Research
|August 17, 2011
Summary
Visual texture segmentation is facilitated by differences in mean orientation, especially when textures abut. However, texture regions differing in orientation variance are processed differently, suggesting distinct visual analysis mechanisms.
Area of Science:
- Visual perception
- Computational neuroscience
- Image processing
Background:
- Visual texture segmentation allows differentiation of abutting, separated, or temporally distinct regions.
- Differences in mean orientation facilitate segmentation, unlike differences in orientation variance.
Purpose of the Study:
- To investigate the mechanisms underlying visual texture segmentation.
- To differentiate between edge-based and region-based texture analysis.
- To explore the role of orientation mean and variance in texture perception.
Main Methods:
- Replication of Wolfson and Landy (1998) using odd-one-out judgments for abutting vs. separated textures differing in mean orientation or variance.
- Experiment examining phase-sensitivity of texture segmentation using high-frequency orientation-reversing stimuli.
- Experiment assessing the effect of eccentric viewing on phase-insensitive texture border perception.
Main Results:
- Judgments of mean orientation differences were more accurate and rapid for abutting textures.
- Judgments of variance differences showed no advantage for abutting textures, but were faster when separated.
- Texture segmentation based on mean orientation differences was phase-insensitive and improved with eccentricity, unlike variance-based discrimination.
Conclusions:
- Distinct edge-based and region-based texture analysis mechanisms exist.
- A fast, sign-invariant contour extraction system likely mediates texture segmentation.
- This system may be linked to the magnocellular visual pathway.
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