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. Author manuscript; available in PMC: 2017 Mar 17.
Published in final edited form as: Psychopharmacology (Berl). 2014 Apr 3;231(20):4019–4029. doi: 10.1007/s00213-014-3541-2

Figure 3. Effects of naltrexone on SA in animals on a multiple schedule receiving alternating 5 min access periods to alcohol and nicotine or to nicotine or alcohol alone.

Figure 3

Mean (± sem) number alcohol (A) or nicotine (B) reinforcements earned and lever presses made by animals receiving alternating access to alcohol alone (Alc alone), nicotine alone (Nic alone) or nicotine and alcohol (Nic + Alc) following injections of vehicle or different doses of naltrexone (0.3, 1.0 mg/kg). Animals received vehicle and each dose of naltrexone in counterbalanced order. * Significantly different from vehicle group (p<0.05).