Preface; Acknowledgements; 1. Emotion since Darwin; 2. Releasers and state-dependent reflexes; 3. Purpose and emotion; 4. Expression: a window on the emotions?; 5. Are physiological changes epiphenomena of emotions?; 6. Somatic influences on the emotion?; 7. Optimal foraging and the partial reinforcement effect: a model for the teleonomy of feelings; 8. Do emotions mature or differentiate?; 9. Cognition, learning and emotion; 10. Interaction of the components of emotion; 11. Of mice and men; 12. Biology and emotion: some conclusions; Glossary; Notes; References; Index.