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. 2011 May 4;6(5):e18978. doi: 10.1371/journal.pone.0018978

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Stanley 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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Under each target is a representative luminance profile comparing target luminance to background luminance. A) Luminance profile for Experiment 1: Average luminance of the targets is equal to the luminance of the background. B) Luminance profile for Experiment 2: Average luminance is equal between targets, but the background luminance is higher than average target luminance.