Steroids, peptides, monoamines, and interacting neural structures are considered in relation to feeding, reproductive behaviour, aggression, stress, and learning in humans and other vertebrates. Seminar and discussions (three hours); one term Prerequisite(s): PSYCH 3M03; and six units of Biochemistry and/or Biology; and registration in Level IV of an Honours program Antirequisite(s): PSYCH 3Y03