rders, which are disturbances of mood such as depression; schizophrenic disorders, which are characterized by major disturbances in personality and distortion of reality; and various personality disorders.
             While psychologists use similar criteria to diagnose abnormal behavior, their perspectives in understanding and treating related disorders vary greatly. For instance, a psychologist with a psychoanalytic approach would explain depression as a reaction to loss, worsened by anger turned inward. A behavioral psychologist would assume a lack of positive reinforcement to be a significant cause in the disease. A cognitive theorist would focus on the negative thought patterns and attitudes of an individual in contributing to his depression. And a psychologist with a biological perspective would consider a chemic
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