Some of our time is spent eating and drinking and some is spent on matters regarding reproduction. Some of us seek fame or recognition while others seek satisfaction internally, with little need for recognition. Some people study for success in a profession, while others might study rocks, birds, or French literature for no apparent reason other than to know about it. Why are we motivated to engage in so many apparently unrelated activities? This book places our various activities into categories, thus providing a framework for understanding how everything that we do fits together and is based on brain mechanisms. Disturbances in motivation play important roles in autism, depression, Parkinson's disease, and addiction. Understanding the motivational aspects of these disorders can help to inform our approach to these conditions. This book may be of value for students in psychology, counseling, management, and anyone who is interested in understanding our daily behavior.