Effects of thioperamide pretreatment on locomotor activity after A.) saline treatment, B.) MK-801 0.05 mg/kg, C.) MK-801 0.1 mg/kg., and D.) MK-801 0.3 mg/kg. An asterisk (*) indicates a significant difference between rats pretreated with either dose of thioperamide and those pretreated with saline. In B., the plus sign (+) indicates a significant difference between all three pretreatment groups. In C., the number sign (#) indicates a significant difference only between the groups pretreated with saline and 10 mg/kg of thioperamide. Data represent mean number of photobeam breaks every 10 minutes ± s.e.m. There were 12 animals in each group although a separate cohort of 12 rats was used to generate the data depicted in D.