Linking object boundaries at scale: a common mechanism for size and shape judgments.
The area over which boundary information contributes to the determination of the center of an extended object was inferred from results of a bisection task. The object to be bisected was a rectangle with two long sinusoidally modulated sides, i.e. a wiggly rectangle. The spatial frequency and amplitude of the edge modulation were varied. Two object widths were tested. The modulation of the perceived center approximately equaled that of the edges at very low edge modulation frequencies and decreased in amplitude with increasing edge modulation frequency. The edge modulation had a greater modulating effect on the perceived center for the narrower object than for the wider object. This scaling with object width didn't follow perfect zoom invariance but was precisely matched by the scaling of the bisection threshold with width, strongly supporting the idea that the same mechanism determines both the location of the perceived center for these stimuli and its variance. We propose that this mechanism is the linking of object boundaries at a scale determined by the object width.
Duke Scholars
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Related Subject Headings
- Size Perception
- Sensory Thresholds
- Judgment
- Humans
- Form Perception
- Experimental Psychology
- 3212 Ophthalmology and optometry
- 17 Psychology and Cognitive Sciences
- 11 Medical and Health Sciences
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Size Perception
- Sensory Thresholds
- Judgment
- Humans
- Form Perception
- Experimental Psychology
- 3212 Ophthalmology and optometry
- 17 Psychology and Cognitive Sciences
- 11 Medical and Health Sciences