Fig. 4
From: Abstract rule learning and generalization in human and nonhuman primates

Humans showed spontaneous rule generalization across stimulus domains. (A) In Phase 1.2, human participants (n = 48, grey circles) performed at very high levels on the standard (color) trials, and all spontaneously generalized to the probe (shape) stimuli. For ease of display, data from human participants are collapsed across all rules (‘AAB’, ‘ABA’, ‘BAA’) based on whichever rule was ‘correct’ for each participant. (B) In Phase 2.4, after learning that the rule which applied to the shape stimuli had changed, every participant generalized this new rule to the shape stimuli, rather than persisting with the prior shape rule.