what is the branch of psychology that is concerned with abnormal behavior
From Wikipedia, the free encyclopedia. Abnormal psychology is the branch of psychology that studies unusual patterns of behavior, emotion and thought, which may or may not be understood as precipitating a mental disorder.ehavioral: The behavioral approach to abnormal psychology focuses on observable behaviors. In behavioral therapy, the focus is on reinforcing positive behaviors and not reinforcing maladaptive behaviors. This approach targets only the behavior itself, not the underlying causes.