[The comparative physiological characteristics of the regulating effect of vasopressin on higher nervous activity in mammals in an ascending order].

Small doses of vasopressin in hedgehogs facilitated positive conditioning as well as formation of extinguishing inhibition. In rabbits [correction of rodents], vasopressin enhanced the trace conditioning however shortly. In monkeys, vasopressin exerts a complicated effect upon simpler conditioning and memory processes, the conditioned memory being obviously enhanced.