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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: Learn Motiv. 2009 May 1;40(2):186–196. doi: 10.1016/j.lmot.2008.11.002

Figure 1.

Figure 1

Performance of each chimpanzee in the natural choisce test of Experiment 1. Asterisks indicate performance that differed from chance responding as assessed with a two-tailed binomial test (all p < 0.05).