What to read after Galen's Prophecy?

Nearly 2000 years ago a physician called Galen of Pergamon suggested that much of the variation in human behavior could be explained by an individual's temperament. Since that time, inborn dispositions have fallen in and out of favour. Based on 15 years of research, this work aims to provide fresh insights into these complex questions, offering evidence to support Galen's ancient classification of melancholic and sanguine adults. Integrating evidence and ideas from biology, philosophy and psychology, Jerome Kagan examines the implications of the idea of temperament for aggressive behavior, conscience, psychopathology, and the degree to which each of us can be expected to control our deepest emotions.