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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: J Exp Anal Behav. 2014 Sep 30;102(3):353–362. doi: 10.1002/jeab.109

Fig. 5.

Fig. 5

The average rate of responses per min on the active lever during periods of S+ and S- presentation under both vehicle and nicotine conditions. Error bars represent the standard error of the mean.