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. Author manuscript; available in PMC: 2010 Feb 22.
Published in final edited form as: Psychopharmacology (Berl). 2007 Jul 8;194(4):463–473. doi: 10.1007/s00213-007-0863-3

Fig. 2.

Fig. 2

Dose-dependent effect of nicotine administered in a response-independent manner on responses on the active (top) and inactive (below) levers (n=8–11). The numbers of responses were averaged across the last three sessions (sessions 18 to 20) of the FR5 phase. **p< 0.01, ***p<0.001, and ****p<0.0001 different from saline group. ^p<0.05, ^^p<0.01, and ^^^^p<0.0001 different from the 0.06 mg kg−1 h−1 group. +p<0.05 different from the 0.12 mg kg−1 h−1 group