Developments in areas such as genetics, brain imaging, behavioral observation, and classification, as well changes in social and gov-ernment policy and in legal decisions, add to our knowledge base and stimulate new treatments for those whose lives are touched by mental disorders. Reflecting this, we have revised this new edition of Abnormal Psychology to reflect the most up-to-date information about diagnostic catego-ries, classifications, and criteria.Įvery time we work on a revision of Abnormal Psychology we are reminded of how dynamic and vibrant our field is. Most recently in abnormal psychology, the pub-lication of the DSM-5, after years of development and consider-able controversy, is one of those momentous changes. And, at some point there are events that occur that force a rethinking of some issues. Although many of the ideas and diagnostic concepts in the field of abnormal psychology have per-sisted for hundreds of years, changes in thinking do occur. Change is a big part of life and new research or novel new theories can impact the way mental health professionals view problems. The guidelines and standards that we follow in our professional activities are not set in stone.
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