OFFENSE PRODUCED BY CHEMICAL-STIMULATION OF THE ANTERIOR HYPOTHALAMUSOF THE RAT

Offense behavior, including bite-and-kick attack, was obtained by micr oinjections of picrotoxin into the anterior hypothalamus of the rat. T his is the first time that it has been possible to obtain offense by c hemical stimulation of the brain, and the localization is more precise than that obtained with electrical stimulation. Mounting behavior and mounting by the opponent were also obtained from the anterior hypotha lamus, the former corresponding to results obtained by previous studie s using electrical stimulation. Other behaviors obtained from the hypo thalamus included locomotion and circling, social and self-grooming, u pright posture and boxing, digging, feeding, and leaping.