Figure 6. Mean activity counts per 15 min pooled over the four conditioning sessions in the vehicle-paired compartment (grey boxes) and in the drug-paired compartment (black boxes) at recovery period from anesthesia induced by 40 mg/kg methohexital or 100 mg/kg propofol. Error bars mean SEM. *P < 0.05 when comparing vehicle-paired and drug-paired compartments for each group.