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. Author manuscript; available in PMC: 2011 Apr 7.
Published in final edited form as: Behav Pharmacol. 2010 May;21(3):182–193. doi: 10.1097/FBP.0b013e32833a5c9e

Figure 6. Effect of omitting the sucrose reinforcer on responding during the nicotine and sucrose components.

Figure 6

Data are expressed as mean (± SEM; N=4) total number of responses during the nicotine components (Panel A) and sucrose components (Panel B) during the last session of sucrose-maintained responding (baseline), as well as the average of responding during sucrose extinction sessions 1–2, 3–4, and 5–6. * denotes a significant difference from responding on the sucrose lever.