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The percentage of correct choices for individual rhesus monkeys and baboons on arbitrary (AB) matching-to-sample baseline trials (solid bars) and symmetry (BA) test trials (hatched bars). Adapted with permission from “A search for symmetry in the conditional discriminations of rhesus monkeys, baboons, and children”, by M. Sidman et al. 1982, Journal of the Experimental Analysis of Behavior, 37. ©1982 by the Society for the Experimental Analysis of Behavior.
