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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 3.

Figure 3

Performance in Phase 1 and Phase 2 of Experiment 3. Phase 1 involved rotation of trials among all four chimpanzees with at least 3 minutes between each trial. Phase 2 involved repeated trial presentations with the same chimpanzees (inter-trial interval approximately 20 seconds). Phase 1 data are separated into the first 10 and last 10 trials of both combined sessions (20 trials in each of those two situations). Asterisks indicate performance that differed from chance responding as assessed with a two-tailed binomial test (all p < 0.05).