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. Author manuscript; available in PMC: 2010 Dec 27.
Published in final edited form as: J Vis. 2010 Sep 10;10(11):11. doi: 10.1167/10.11.11

Figure 1.

Figure 1

Stimulus composition. (A) Texture-defined form stimuli were created by periodic modulation of two orthogonal noise patterns (carriers 1 and 2). Each carrier pattern was multiplied by a low spatial frequency grating (modulators M and −M). A square root operation was applied to each modulator to ensure that contrast energy did not vary across the final image. The resulting contrast-modulated carrier patterns were combined additively to produce the final image (adapted from Landy & Oruç, 2002). (B) Stimulus composed of vertical and horizontal carriers. (C) Stimulus composed of right- and left-oblique carriers. (D) Contrast-defined form stimulus created by sinusoidal contrast modulation of an isotropic noise carrier pattern. (E) Control luminance-defined stimulus.