briefly evaluate defence mechanisms as a way of explaining human behaviour
Fisher and Greenberg - meta analysis 2500 studies found support for the existence of uncoscious motivation in human behaviour as well as for the defense mechanisms of repression denial and displacamenet, supports the existence of defence mechanisms.
2. SOTIVOT- success of psychoanalysis suggests that unconscious defence mechanisms exist.
3. no way objectively measure them because occur in the unconscious can't be sure they exist due to lack of emprical conformation, cant be directly observed and cant be falsified.