Sigmund Freud was the first major social scientist to propose a unified theory to understand and explain human behavior. No theory that has followed has been more complete, more complex, or more controversial. Some psychologists treat Freud's writings as a sacred text - if Freud said it, it must...

When most people think of the word "psychology," they envision a person with a mental disorder or a therapist who treats such people. Actually, psychology, as a social scientific discipline, is the study of human thoughts, behaviors, beliefs, or emotional feelings. There are many different...