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. Author manuscript; available in PMC: 2013 Jun 15.
Published in final edited form as: Behav Brain Res. 2012 Apr 4;232(1):202–209. doi: 10.1016/j.bbr.2012.03.042

Figure 2.

Figure 2

Length of the mean delay per session for Group 1 mice for the first 12 weeks under the titrating schedule. Each data point represents the mean ± S.E. There was not a significant overall effect between the two lines (F(1,11)=3.123, p>0.05), while there was a significant effect between the weeks (F(1,11)=15.304, p<0.05); there was not a significant interaction between line and week (F(1,11)=1.240, p>0.05). The arrows at the top of the graph indicate when the 1- and 3-second titration steps were in effect.