Find 
by implicit differentiation. 
Definitions:
Impulsivity
A trait signifying a tendency to act on a whim, displaying behavior characterized by little or no forethought, reflection, or consideration of the consequences.
Biopsychosocial Approach
A holistic perspective in health and illness considering biological, psychological, and social factors as interconnected influences.
DSM-IV-TR
The American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, updated as a 2000 “text revision”; a widely used system for classifying psychological disorders.
Medical Model
A framework in which psychological disorders are treated as medical diseases, emphasizing diagnosis, treatment, and cure.
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