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The speed of intravenous cocaine delivery does not influence self-administration behavior when access to the drug is limited (1 h/session). Number of infusions earned (a) and inter-infusion interval (b) in animals self-administering 0.5 or 0.25 mg/kg/infusion cocaine delivered over 5 or 90 s. (c) Cumulative response records for self-administered infusions in a representative rat from each group during the last of the three ShA sessions. Data represent mean±SEM. n=11–16/group.
