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. Author manuscript; available in PMC: 2016 Mar 21.
Published in final edited form as: Anim Behav. 2008 May 1;75(5):1757–1770. doi: 10.1016/j.anbehav.2007.09.036

Figure 8.

Figure 8

Mean ± SE percentage of trials (out of trials in which actor pulled at least one tray) on which actors pulled the other reward across sessions in experiment 2 when a recipient was present (—•—) or absent (—□—).