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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Behav Processes. 2011 Oct 14;89(3):197–202. doi: 10.1016/j.beproc.2011.09.010

Fig. 1.

Fig. 1

Images showing the general test procedure. (A) Experimenters at different distances from the monkey displayed different amounts of apple slices. (B) Once the monkey saw both options, the experimenters placed the food items on the trays then turned and walked away to allow the monkey to choose. (C) A clearer view of the different distances of the experimenters from the monkey (10 and 15 ft) as well as the angle between the experimenters (90°). (D) Illustration of the testing paradigm, with A1 the closer, smaller amount and A2 the farther, larger amount.