Detection thresholds for spiral Glass patterns.
We measured thresholds for the detection of spiral Glass patterns in the presence of random noise. The patterns were constructed so that the orientation content did not vary as a function of spiral angle or signal level. We found that spiral patterns had higher thresholds than either radial or concentric Glass patterns. The results support the idea that the human visual system is specialized to detect radial and concentric patterns.
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Center for Neurobiology and Behavior and Department of Psychiatry, Columbia University, 722 W. 168th Street, New York, NY 10032, USA.
Ferrera
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D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D004056:Differential Threshold; D004192:Discrimination, Psychological / Q000502:physiology*; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D016013:Likelihood Functions; D008297:Male; D008960:Models, Psychological; D009949:Orientation / Q000502:physiology*; D011601:Psychophysics