Amnesia/drug therapy; Learning/drug effects; Marsileaceae/chemistry; Memory/drug effects; Nootropic Agents/therapeutic use; Phytotherapy; Plant Extracts/therapeutic use; Acetylcholinesterase/metabolism; Amnesia/enzymology; Amnesia/metabolism; Animals; Behavior, Animal/drug effects; Disease Models, Animal; Dose-Response Relationship, Drug; Frontal Lobe/drug effects; Frontal Lobe/enzymology; Frontal Lobe/metabolism; GPI-Linked Proteins/antagonists & inhibitors; GPI-Linked Proteins/metabolism; Hippocampus/drug effects; Hippocampus/enzymology; Hippocampus/metabolism; Male; Medicine, Ayurvedic; Muscarinic Agonists/therapeutic use; Nerve Tissue Proteins/metabolism; Neurons/drug effects; Neurons/enzymology; Neurons/metabolism; Nootropic Agents/administration & dosage; Plant Extracts/administration & dosage; Rats; Rats, Wistar; Receptors, Muscarinic/metabolism