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Changes in perceived contrast of suprathreshold gratings as a function of orientation and spatial frequency

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Orientation anisotropy for suprathreshold gratings of different spatial frequencies was measured using a contrast matching procedure. Observers matched the contrast of sine-wave gratings of various orientations to a vertical reference grating set at different reference contrasts. At threshold, the size of the anisotropy increased with spatial frequency, confirming previous results. When the reference grating contrast was set above threshold, the anisotropy declined, and eventually disappeared for gratings of medium spatial frequencies. At higher spatial frequencies, although the relative anisotropy became smaller, it did not disappear within the range of contrasts used in this study. For medium, but not for high spatial frequencies, the data are consistent with Kulikowski's (1976) model of effective contrast constancy.

Affiliations: 1: Department of Psychology, University of Western Ontario, London, Ontario, Canada, N6A 5C2

10.1163/156856887X00178
/content/journals/10.1163/156856887x00178
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/content/journals/10.1163/156856887x00178
1987-01-01
2016-12-03

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