Treatment

Discrimination index

Vehicle (10 ml/kg)

0.25 ± 0.019

CF (100 mg/kg)

0.33 ± 0.035

CF (250 mg/kg)

0.35 ± 0.024^*

CF (500 mg/kg)

0.36 ± 0.027^*

CF (1000 mg/kg)

0.38 ± 0.035^**

PT (150 mg/kg)

0.40 ± 0.008^**