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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 1. Responding under a Mult schedule of cocaine and sucrose reinforcement.

Figure 1

In Panel A, data are expressed as mean (± SEM; N=9) total number of responses on the cocaine and sucrose levers during both of the cocaine and sucrose components, respectively. * denotes a significant difference from responding on the sucrose lever, p<.05. # denotes a significant difference from responding on the cocaine lever during the cocaine components, p<.05. In Panels B and C, data are cumulative records of a representative rat responding on the cocaine lever (Panel B) and sucrose lever (Panel C) under the Mult schedule of cocaine and sucrose reinforcement. Responses on the cocaine or sucrose lever resulted in the vertical movement of the pen. Upon completion of the FR15, the pen was diagonally displaced, indicating the delivery of either the cocaine infusion or sucrose pellet. The components and 5-min TO between components are indicated on event line.