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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Addict Biol. 2013 Mar 18;19(5):800–811. doi: 10.1111/adb.12048

Fig. 3.

Fig. 3

The number of active and inactive lever presses (means ± SEM) for Wistar and P rats self-administering 10, 50 or 100 μM nicotine into the posterior VTA during sessions 1-4, aCSF for sessions 5 and 6, and the original infusate during session 7. Asterisks represent significant (p<0.05; Tukey’s) differences from responding observed for rats self-infusing aCSF, and responding on the active lever significantly differed (p < 0.05) from responding on the inactive lever (determined by one-way ANOVAs performed on individual sessions contrasting active and inactive lever presses). Plus symbols indicated differences from responding observed for rats self-infusing aCSF, responses on the active lever significantly differed (p < 0.05) from responding on the inactive lever and higher responding on active lever by P rats compared to Wistar rats.