Remark : - After the 30 min adaptation period, 0.032-0.125 mg/kg of spiperone was administered, followed 10 min later by administration of 200 mg/kg of PUL. The ambulatory activity of individual ICR mouse was continuously measured in the following experiments, and the activity during the 60 min after the final administration of the agents was also recorded.
Results: spiperone suppressed the ambulation-promoting of 200 mg/kg of PUL (closed columns; F(3, 76) = 17.173, P < 0.05); differences from control, 0.032 mg/kg = 158.5 (P < 0.0001); 0.063 mg/kg = 217.65 (P < 0.0001); 0.125 mg/kg = 240.7 (P < 0.0001).