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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: Addict Biol. 2016 Sep 14;22(6):1501–1514. doi: 10.1111/adb.12450

Figure 5.

Figure 5

(a) Mean (± SEM) percent choice of cocaine in subgroups of rats for which cocaine had higher essential value than saccharin (black bar) or saccharin had higher essential value than cocaine (white bar). (b) Sequential dependencies in Exp. 2. Data presented are the mean (± SEM) percentage of free choices for cocaine when the choice on the preceding trial was for cocaine (black bars) or saccharin (white bars) in cocaine preferrers and saccharin preferrers. (c) Mean (± SEM) percent choice of cocaine in cocaine preferrers (filled circles) and saccharin preferrers (open circles) during the final five sessions of the original choice phase with a 10-min inter-trial interval (ITI) separating choices, during the five sessions with a 60-min ITI, and on the five sessions when rats were returned to the 10-min ITI procedure. (d) Sequential dependencies during choice sessions with the 60-min intertrial interval in Exp. 2. Data presented are the mean (± SEM) percentage of free choices for cocaine when the choice on the preceding trial was for cocaine (black bars) or saccharin (white bars) in cocaine preferrers (n = 9) and saccharin preferrers (n = 8). *** indicates p < 0.001. * indicates the main effect of trial type was significant at p < 0.05.