Amnesia is induced in mice within 1 hour following i.p. injection of acetylcholine receptor antagonists (scopolamine, mecamylamine).

References

Kwon SH, Ma SX, Joo HJ, Lee SY, Jang CG (2014) Inhibitory effects of eucommia ulmoides oliv. bark on scopolamine-induced learning and memory deficits in mice. Biomol Ther (Seoul) 21(6):462-469