FIG. 1. Sites in the hypothalamus where offense was obtained by picrotoxin injections. Sites in which bite-and-kick attack was obtained are shown on the left side of each brain section, while two other offense behaviors, offensive sideways posture and on-top posture, are shown on the right side. Sites with other behaviors are represented by filled circles. Sections are derived from the atlas of Paxinos and Watson (22). Sites from females were originally marked on sections from the atlas of Konig and Klippel (12), but have been transcribed onto the anatomically equivalent planes in the Paxinos and Watson atlas for this illustration.