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Baseline behavior during cocaine self-administration sessions in each of the ten groups of rats prior to any treatment. Values are the mean ± S.E.M. number of active and inactive lever responses (A) and infusions earned (B). Bi = Bilateral; Asym = Asymmetric; Uni = Unilateral; Ipsi = Ipsilateral; Veh = Vehicle; and Lido = Lidocaine.
