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. Author manuscript; available in PMC: 2009 Jan 1.
Published in final edited form as: Anim Behav. 2008 Jan;75(1):245–257. doi: 10.1016/j.anbehav.2007.04.032

Figure 2.

Figure 2

Percent success (mean ± SEM) for all experiments. Planned t-tests were conducted between Mutualism and Reciprocal Reward (P = 0.041), Reciprocal Reward and Centered Reward (P = 0.907), and Reciprocal Reward and Delivered Reward (P = 0.124).