a trend toward significancep = 0.0554
4 mg/kg-naloxone pretreatment in vehicle-treated mice indicated a main effect of naloxone on open zone occupancy (naloxone > vehicle; F 1,34 = 7.166, p = 0.0114), but not open zone entries ( F 1,34 = 2.826, p = 0.1019) and a trend toward significance for total distance traveled ( F 1,34 = 3.937, p = 0.0554).