Group

Treatment

Group A (Normal control)

Group B (Negative control)                

Group C (Positive control)

Group D (Experimental group)        

Group E (Experimental group)

Group F (Experimental group)

Normal saline

Ketamine (15mg/kg bw)

Donepezil (1mg kg^-1 bw^-1) + Ketamine (15mg kg^-1 bw^-1)

Plant extract (200mg kg^-1 bw^-1) + Ketamine (15mg kg^-1 bw^-1)

Plant extract (300mg kg^-1 bw^-1) + Ketamine (15mg kg^-1 bw^-1)

Plant extract (400mg kg^-1 bw^-1) + Ketamine (15mg kg^-1 bw^-1)