This text introduces underlying principles of the endocrine regulation of behavior in animals and humans. Every chapter begins by stating a principle, followed by specific examples of hormone actions derived from scientific experiments and clinical observations, and concludes with a few challenging unanswered questions. The reference source "Hormones, Brain & Behavior" identified this field as rapidly expanding within neurobiology and endocrinology. Now, this well-illustrated and referenced text will serve students from undergraduate school to medical school as they learn this new discipline. It offers uniform presentation of material across all chapter, with each chapter addressing a key principle, illustrated by basic experimental and clinical examples. It includes user-friendly features such as boxed figures with extended captions and references, numerous clinical notes, and a comprehensive list of abbreviations. The illustrations highlight both the clinical and basic science information.