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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 4.

Figure 4

Experiment 4 results, with one choice giving a mini marshmallow followed 4 s later by a Cheerio (A2 → B2), and the other giving a Cheerio followed 4 s later by a mini marshmallow (B2 → A2). The y axis plots the mean percentage of trials that each monkey selected (A2 → B2) 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.