This book provides an in-depth overview of the field of psychology, covering topics ranging from perception and learning to motivation and emotion. Written by two renowned psychologists -- Edwin Guthrie and Stevenson Smith -- the book draws on a wealth of research and real-world examples to provide a comprehensive and engaging account of the science of human behavior. Whether you are a student of psychology or simply interested in how the mind works, this book is an essential and rewarding read. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.