They are more accurately referred to as ''ego defence mechanisms'', and can thus be categorized as occurring when the id impulses are in conflict with each other, when the id impulses conflict with super-ego [[values]] and [[beliefs]], and when an external threat is posed to the ego. | They are more accurately referred to as ''ego defence mechanisms'', and can thus be categorized as occurring when the id impulses are in conflict with each other, when the id impulses conflict with super-ego [[values]] and [[beliefs]], and when an external threat is posed to the ego. |