Final answer:
Abnormal behavior develops when the ego is deficient in regulating functions such as delaying and controlling impulses or marshaling appropriate normal defenses to stronger internal conflicts. This is a characteristic of psychodynamic theory.
Step-by-step explanation:
The subject of this question is Psychodynamic theory.
According to Freud's psychodynamic theory, abnormal behavior develops when the ego is deficient in regulating functions such as delaying and controlling impulses or marshaling appropriate normal defenses to stronger internal conflicts.
The ego, which is part of Freud's tripartite model of personality (id, ego, and superego), serves as the mediator between the conflicting forces of the id (the primitive, pleasure-seeking part) and the superego (the moral conscience).