Compare and contrast how the humanistic-existential model and the biological model differ in their understanding of causes of abnormality.

Biological theorists adopt a medical perspective and believe that abnormal behavior is the result of physical malfunctioning. Theorists of this perspective often focus on brain anatomy, brain chemistry, genetics, hormones, or other physiological malfunctions.
The humanistic-existential model believes that dysfunction is the result of self-deceit or the avoidance of responsibility. Humanists believe that humans are driven to self-actualize, and when this drive is interfered with, dysfunction can result.
Existentialists believe that abnormal behavior stems from hiding from life's responsibilities and encourage individuals to accept responsibility for their lives and to recognize the freedom they have to lead a life they choose with greater meaning to
them.