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. Author manuscript; available in PMC: 2009 Feb 1.
Published in final edited form as: Behav Processes. 2007 Dec 3;77(2):199–209. doi: 10.1016/j.beproc.2007.11.009

Fig. 3.

Fig. 3

The three trios of stimuli used in Experiment 2. Each trio included a target shape (the choice of which was reinforced) plus metric (MEM) and nonaccidental (NAM) modifications (the choice of which was not reinforced).