Fig. 2
From: Abstract rule learning and generalization in human and nonhuman primates
Abstract rule learning in six rhesus macaques. Phase (1.1) Over time, all monkeys learned the abstract rules, requiring that they generalized to novel colored stimuli on each trial. Colored lines show the proportion of trials on which the stimuli conforming to each rule type were selected (blocks of 200 trials). Thicker lines denote the ‘correct’ rule for each monkey. Dashed line shows chance performance and shaded gray areas denote 95% confidence intervals (calculated by permutation test). Phase (1.2) Performance remained very high on standard (color) trials (left; p < 0.0001 in all cases), but monkeys show no generalization on probe (shape) trials (right, blue background; p > 0.05 in all cases). These data are also visualized using a 200 trial sliding window (S1) and aggregated by testing day (S2).
