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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Neurosci Biobehav Rev. 2013 Feb 21;37(0):10.1016/j.neubiorev.2013.02.008. doi: 10.1016/j.neubiorev.2013.02.008

Figure 2.

Figure 2

Effect of cue removal on cocaine self-administration behavior in STs (n=14) and GTs (n=16). STs and GTs have an equivalent rate of self administration when a light cue signaled drug delivery (sessions 1–3, 6–9), but on the two sessions when the light cue was omitted (sessions 4–5), the rate of self-administration in STs, but not GTs, was significantly reduced. Symbols represent the mean ± SEM. *P < 0.05. Data adapted from Saunders and Robinson (2010), with permission.