Table 1.

The order of drug experiments and an example of the drug treatments for one rat.

Experiment	Test drug	Challenge drug	An example animal
1	Sodium valproate 100–200 mg/kg	None	Sodium valproate 200 mg/kg + vehicle
2	Sodium valproate 100–200 mg/kg	PCP 1.5 mg/kg	Vehicle + PCP 1.5 mg/kg
3	Sodium valproate 100–200 mg/kg	Amphetamine 0.5 mg/kg	Sodium valproate 200 mg/kg + amphetamine 0.5 mg/kg
4	Phenytoin 25–100 mg/kg	None	Vehicle + vehicle
5	Phenytoin 25–100 mg/kg	PCP 1.5 mg/kg	Phenytoin 100 mg/kg + PCP 1.5 mg/kg
6	Phenytoin 25–100 mg/kg	Amphetamine 0.5 mg/kg	Vehicle + amphetamine 0.5 mg/kg