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Number of infusions during the 4 hr session in 30 min blocks for male Wistar rats self-infusing 200 mg% EtOH into the posterior VTA during the first four sessions (only sessions 1 and 4 are shown), 200 mg% EtOH plus 100 μm quinpirole (Quin) in sessions 5 and 6 (only session 6 is shown), and 200 mg% EtOH μm quinpirole and 100 μm sulipride (Sulp) in sessions 7 and 8 (only session 8 is shown). Data are the means ± SEM; n = 6.
