Epinephrine, derived from the adrenal medulla, enhances memory storage for several forms
of learning. One physiological action of this hormone is to liberate hepatic glucose stores.
This experiment tested the possibility that glucose could itself enhance memory. Rats were
water deprived, pretrained to drink, pretrained to drink in the behavioral apparatus, and then
trained in a one-trial inhibitory (passive) avoidance task. Immediately after the training
footshock, the animals each received an injection of glucose (1.0–500 mg/kg). When tested …