Results of color patches defined by the group analysis.

<p>(A) Color biased clusters defined by the group analysis based on the 6 hemispheres from the 3 subjects (<i>p</i> < 0.01, uncorrected) from Exp 1 are shown on the lateral view of the template inflated surface of the left hemisphere. Red solid lines indicate that clusters could be defined at <i>p</i> < 0.05 (uncorrected), while white solid lines indicate clusters that could be defined when adjusting the contrasted achromatic grating to the next lower level (i.e., from 50% to 25% in M1 and M2, <i>p</i> < 0.01, uncorrected) to account for the relatively weak color bias in the right hemisphere. Blue bullseye marks the approximate location of the fovea based on the data set shared by Janssens and colleagues [<a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.3002863#pbio.3002863.ref094" target="_blank">94</a>], which was downloaded from <a href="https://gbiomed.kuleuven.be/english/research/50000666/50000669/50488669/neuroserv/publications/JNEUROSCI" target="_blank">https://gbiomed.kuleuven.be/english/research/50000666/50000669/50488669/neuroserv/publications/JNEUROSCI</a>. The permission to use dataset from Janssens and colleagues [<a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.3002863#pbio.3002863.ref094" target="_blank">94</a>](<a href="https://www.jneurosci.org/content/34/31/10156" target="_blank">https://www.jneurosci.org/content/34/31/10156</a>) has been granted by the corresponding author, Wim Vanduffel. (B) Averaged fMRI responses elicited by chromatic and achromatic gratings, which were not used to define color patches, in color patches defined by the group analysis across 3 monkeys. Red asterisks indicate a significant difference between chromatic and achromatic gratings; *q < 0.05, ***q < 0.001. (C) Chromatic and achromatic decoding accuracy when training the classifier to distinguish among the 3 chromatic/achromatic gratings in N-1 runs and testing on the left-out run in Exp 1. (D) Results of classification of grayscale objects with red and green memory colors: training the classifier to distinguish half set of the red and green color-diagnostic grayscale objects and testing on the other half in Exp 2. (E) Results of memory color decoding based on chromatic gratings training: training the classifier to distinguish among 3 chromatic gratings in Exp 1 and then testing on 3 categories of grayscale objects in Exp 2. (F) Results of true-false color decoding: training on true- and false-colored objects in N-1 runs and testing on the left-out run in Exp 3. Bars display mean values +/− SEM. Black asterisks indicate a significant difference from the chance level (0.333 in C and E, 0.5 in D and F, indicated by the dashed lines); *q < 0.05, **q < 0.01, ***q < 0.001. The data underlying this figure are available in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.3002863#pbio.3002863.s036" target="_blank">S1 Data</a>.</p> <p>(PDF)</p>