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Extinction of responding for cocaine in sign-trackers (n=14) and goal-trackers (n=16), when a response continued to produce the cocaine-associated CS. (a) The mean ± SEM number of active responses for the CS, expressed in 4-session blocks. (b) The mean ± SEM number of active responses for the CS during the first 4 extinction sessions (effect of group, F(1,85) = 4.57, p = 0.035). *, indicates a significant group difference, p < 0.05.
