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The percentage of correct choices by a chimpanzee (Lana) on arbitrary (AB) matching-to-sample baseline trials and symmetry (BA) test trials over 12 consecutive test sessions. Adapted with permission from “Testing for symmetry in the conditional discriminations of language-trained chimpanzees”, by N. Dugdale and C. F. Lowe, 2000, Journal of the Experimental Analysis of Behavior, 73, p. 15. ©2000 by the Society for the Experimental Analysis of Behavior.
