Final answer:
The psychodynamic perspective posits that a key purpose of behaviour is to reduce inner tension caused by internal conflicts and societal demands, stemming from unconscious processes and early experiences.
Step-by-step explanation:
According to the psychodynamic perspective, one purpose of behavior is to reduce the tension that has been brought about by powerful inner forces such as conflicts between personal needs and society's demands. The psychodynamic approach to psychology, originated by Sigmund Freud, suggests that psychological processes are flows of psychological energy in a complex brain, with the goal of reducing built-up psychological tension. This perspective emphasizes the influence of the unconscious mind, as well as early childhood experiences, on behaviour. It involves the interplay of various drives and forces within the individual, particularly unconscious, and between the different structures of the personality.