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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 20, Iss. 3 — Mar. 1, 2003
  • pp: 401–410

Detection and discrimination of texture modulations defined by orientation, spatial frequency, and contrast

Nicolaas Prins and Frederick A. A. Kingdom  »View Author Affiliations


JOSA A, Vol. 20, Issue 3, pp. 401-410 (2003)
http://dx.doi.org/10.1364/JOSAA.20.000401


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Abstract

We sought to determine whether the detection and the identification of texture modulations are mediated by a common mechanism. On each trial two textures were presented, one of which contained a modulation in orientation (OM), spatial frequency (FM), or contrast (CM). Observers were required to indicate whether the modulated texture was presented in the first or the second interval as well as the nature of the texture modulation. The results showed that for two of the three pairwise matchings (OM–FM and OM–CM) detection and identification performance were nearly identical, suggesting a common underlying mechanism. However, when FM and CM textures were paired, discrimination thresholds were significantly higher than detection thresholds. In the context of the filter–rectify–filter model of texture perception, our results suggest that the mechanisms underlying detection are labeled with respect to their first-order input; i.e., the identities of these mechanisms are available to higher levels of processing. Several possible explanations for the misidentification of FM and CM at detection threshold are considered.

© 2003 Optical Society of America

OCIS Codes
(330.1880) Vision, color, and visual optics : Detection
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5000) Vision, color, and visual optics : Vision - patterns and recognition
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.7310) Vision, color, and visual optics : Vision

History
Original Manuscript: July 17, 2002
Revised Manuscript: October 1, 2002
Manuscript Accepted: October 2, 2002
Published: March 1, 2003

Citation
Nicolaas Prins and Frederick A. A. Kingdom, "Detection and discrimination of texture modulations defined by orientation, spatial frequency, and contrast," J. Opt. Soc. Am. A 20, 401-410 (2003)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-20-3-401


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  15. We model the spectral amplitude distribution here as H(f, θ)=exp(-0.5[(f-f0)/(f0σf)]2)exp(-0.5[(θ-θ0)/σθ]2), where f is frequency, f0 is the dc spatial frequency (5 cpd), σf is a constant determining spatial-frequency bandwidth and set at a value of 0.41, θ is orientation, θ0 is the dc orientation of the texture (0°, horizontal), and σθ is a constant determining orientation bandwidth and set at 25.5. This function describes the average spectral content of the textures used here quite well.14
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