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Global detection of symmetry.
- Source :
-
Perceptual and motor skills [Percept Mot Skills] 1977 Dec; Vol. 45 (3 Pt 2), pp. 1267-73. - Publication Year :
- 1977
-
Abstract
- Two experimental approaches examined observers' ability to characterize shape symmetry based upon the information obtained within a single fixation. Exp. I tested observers' ability to discriminate among three levels of symmetry on the basis of a 25-msec. presentation. Results indicated that identification accuracy was higher for symmetrical and asymmetrical shapes than for mixed shapes, which contained both symmetrical and asymmetrical components. Exp. II tested observers' ability to detect a given level of symmetry by means of a signal-detection approach. Symmetrical shapes were detected better than asymmetrical shapes. Detectability of mixed shapes was lower than that for both symmetrical and asymmetrical shapes. The results of Exps. I and II demonstrate that observers can characterize shape symmetry on the basis of information available within a single fixation. The data are supportive of the hypothesis that a global response to the over-all configuration of the shape serves to facilitate form perception.
Details
- Language :
- English
- ISSN :
- 0031-5125
- Volume :
- 45
- Issue :
- 3 Pt 2
- Database :
- MEDLINE
- Journal :
- Perceptual and motor skills
- Publication Type :
- Academic Journal
- Accession number :
- 604912
- Full Text :
- https://doi.org/10.2466/pms.1977.45.3f.1267