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Experiment 1. A: trial schematics for high contrast (top) and low contrast (bottom) conditions, set size 4. Trials were intermixed. B: luminance of colored squares and background. C: accuracy for high contrast (◇) and low contrast (■) conditions. Average working memory capacities (K) across subjects were 2.5 and 1.71 for high and low contrast conditions, respectively, and difference was significant paired t-test, t(14) = 6.763, P < 0.001.
