In the new Fourth Edition, Martin E. P. Seligman and new coauthor Elaine F. Walker once again establish Abnormal Psychology as a visionary text with a new integrative approach that explores the interactions between the psychological and biological influences on human behavior.In addition to nearly 1,800 new references, the Fourth Edition highlights important new trends in the field, from the explosion in biological and neuroscience research, to new life-span developmental theories, to the challenges confronted by scientists and clinicians working in the field, to the impact of psychological disorders on patients, their families, and society.