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Slip-down behavior from a raised platform of Slc:ddY mice was examined. Mice intraperioneally injected with 1 or 1.5 mg/kg of methamphetamine (MAP) slipped down from a raised platform of 10 cm diameter and 20 cm height within 5 min, 20 min after the injection. After pretreatment five times with 1 mg/kg MAP at intervals of 3 days, the slip-down was induced after injection of 0.5, 1 or 1.5 mg/kg MAP, but after pretreatment ten times with 1 mg/kg MAP at intervals of 3 days the behavior was not recognized at the same doses. These phenomena were like reverse-tolerance and tolerance. The situational change of the MAP treatments, placement on the platform after each pretreatment, did not affect the phenomena. The present findings strongly suggest that the slip-down is a behavior affected by the dose and number of administration of MAP, but not by the treatment situation.

Slip-down from a Raised Platform: Another Behavior of Slc:ddY Mice Treated with Methamphetamine