Fig. 5.

Calculated cocaine level at the first and last cocaine induced lever press (pink circles and pink squares respectively) after the injection of a single i.v dose of cocaine; and the first and last lever press (cyan circle and cyan square respectively) during unloading phase of standard FR1 cocaine self-administration session or FR1 SA Unloading. Each data point represents the mean calculated cocaine level and the error bars represent the standard error of the mean for the corresponding lever press for a dose or FR1 SA Unloading.