Table 1.

Treatment of randomized mice for in vivo cognitive-enhancing activities.

Treatment groups		Treatment
I	Normal control	Normal saline only (10 ml/kg bw; i.p)
II	Negative control	Normal saline+scopolamine (1 mg/kg bw; i.p)
III	Positive control	Donepezil (1 mg/kg bw; p.o)+scopolamine (1 mg/kg bw; i.p)
IV	Experimental group 1	Extract (50 mg/kg bw; p.o)+scopolamine (1 mg/kg bw; i.p)
V	Experimental group 2	Extract (100 mg/kg bw; p.o)+scopolamine (1 mg/kg bw; i.p)
VI	Experimental group 3	Extract (200 mg/kg bw; p.o)+scopolamine (1 mg/kg bw)

All the administered drugs were prepared in normal saline (0.9% NaCl). Extract: aqueous/methanolic stem bark extracts of P. thonningii; p.o: oral administration; i.p: intraperitoneal administration.