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. 2012 Apr 30;7(4):e35950. doi: 10.1371/journal.pone.0035950

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Harding et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) Cartoon showing the colour Mach card, card angle θ, and viewing arrangement (not to scale) for roof (top row) and corner (bottom row) configurations. Note monocular viewing aperture. (b) Colour and luminance gradient stimuli for the cards used (top: roof, bottom: corner, angle 50 deg). (c) Outline cue stimuli, top: roof, bottom: corner, angle 50 deg.