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. Author manuscript; available in PMC: 2012 Sep 10.
Published in final edited form as: Q J Exp Psychol (Hove). 2011 Sep 20;64(12):2301–2315. doi: 10.1080/17470218.2011.591936

Figure 1.

Figure 1

Experiment 1 results, with one choice giving a grape followed 4 s later by a half vegetable (A → B), and the other giving a half vegetable followed 4 s later by a grape (B → A). The y axis plots the mean percentage of trials that each monkey selected (A → B) from the first significant session to the third significant session. Error bars are standard errors of measurement, the dashed line at 50% is random performance, and asterisks represent each monkey’s chi-squared (χ2) p-value across the sessions: *p < .05, **p < .01, ***p < .001.