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. Author manuscript; available in PMC: 2008 Jun 15.
Published in final edited form as: Drug Alcohol Depend. 2007 Jan 19;89(1):52–59. doi: 10.1016/j.drugalcdep.2006.11.020

Figure 1.

Figure 1

Panel A shows the mean (±1 SEM) number of reinforcers earned during the stimulus comparison phase. Panel B illustrates the mean (±1 SEM) number of reinforcers earned during nicotine/saline testing sessions. * in Panel A indicates reinforcers earned for HL-OFF group differs from STIM-ON group. * in Panel B indicates that reinforcers earned in HL-OFF/NIC group differs from HL-OFF/SAL group.