Effects of injections of dopamine uptake inhibitors alone on spontaneous locomotor activity and stereotyped behavior in naïve rats. Saline (open circles), cocaine (filled circles, 1.0 - 56 mg/kg), methylphenidate (triangles up, 1.0 - 30 mg/kg), JHW 007 (triangles down, 10 and 17 mg/kg), AHN 1-055 (diamonds, 3.0, 10 mg/kg) and AHN 2-005 (squares, 3.0 and 10 mg/kg) were administered i.p. five, five, five, 180, 90, and 90 min, respectively, before recording observations. Each point represents the mean ±SEM (N=6). Panel A. Effects on spontaneous locomotor activity. Ordinates: Activity counts (0-30 min). Abscissae: drug dose in mg/kg/inj. Veh: vehicle. Panel B. Effects on stereotypy scores. Ordinates: Stereotypy scores (0-30 min). Abscissae: drug dose in mg/kg/inj. Veh: vehicle.