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. Author manuscript; available in PMC: 2016 Dec 12.
Published in final edited form as: J Comp Psychol. 2010 Nov;124(4):369–380. doi: 10.1037/a0019855

Figure 3.

Figure 3

Chimpanzees’ performance in Phase 2 of Experiment 1 as a function of the number of one-item tokens being compared to a single three-item token. Data are split into separate charts on the basis of general test procedure. The x-axis represents the level of chance performance, so bars above and below the x-axis represent selection biases for the one-item token(s) and three-item token, respectively. Lower case o’s and t’s denote statistically significant biases for one-item and three-item token options, respectively (two-tailed binomial test, p < 0.05). Note that Panzee only completed 15 trials of each type in the phase represented by section b.