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. 2017 Feb 23;7:42972. doi: 10.1038/srep42972

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Copyright © 2017, The Author(s)

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(A) Isoluminance condition. The average threshold change produced by the two 2-color (RG and RB, green and purple symbols) and the one 4-color (RGBY, pink symbols) isoluminance conditions at different noise densities. (B) Luminance condition. The average threshold change produced by the two 2-color (WK and WR, green and purple symbols) and the one 4-color (WKRG, pink symbols) luminance conditions at different noise densities. The error bar is the standard error. The smooth curves are the predictions of the model.