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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Psychopharmacology (Berl). 2015 May 19;232(17):3149–3160. doi: 10.1007/s00213-015-3962-6

Fig. 5.

Fig. 5

Performance during the test for conditioned reinforcement. During this test a nose poke into the active port resulted in presentation of the cue either previously paired or unpaired with non-contingent nicotine delivery for 2 sec. Data represent the mean ± SEM difference in nose pokes into the Active minus Inactive port during the conditioned reinforcement test where each data point represents an independent group of rats (UP STs n=8, GTs n=8; 7.5 μg/kg nicotine STs n= 12, GTs n= 12; 15 μg/kg nicotine STs n= 14, GTs n= 15; 25 μg/kg nicotine STs n= 15, GTs n= 16). UP= Unpaired. *, indicates a significant group difference between STs and GTs. p< 0.05.