Book excerpt: Dreams puzzled early man, Greek philosophers spun elaborate theories to explain human memory and perception, Descartes postulated that the brain was filled with “animal spirits,” and psychology was officially deemed a “science” in the 19th century. In the Seventh Edition of AN INTRODUCTION TO THE HISTORY OF PSYCHOLOGY, International Edition, Hergenhahn and Henley demonstrate that most of the concerns of contemporary psychologists are manifestations of themes that have been part of psychology for hundreds—or even thousands—of years. This comprehensive book’s numerous photographs and pedagogical devices, along with its biographical material on key figures in psychology, engage students and facilitate their understanding of each chapter.