Then, personality development theory, based on the basis of the  earlier theory of unconsciousness and consciousness, was brought forth by Sigmund Freud。 As far as he is concerned, human personality, a dynamical system, is consist of three major parts: the id, the ego and the super-ego。 Each of them has its respective features and the guiding  principles and performs different roles and functions in the psychological process。 Sometimes, all three cooperate fully with each other, while sometimes they restrict with each other。 We may make a distinction between the id, the ego and the super-ego in a different case。来自~优尔、论文|网www.youerw.com +QQ752018766-

The id, which is the genetic animal instinct and the primitive dynamical system, contains life-sustaining desire, impulsion and vitality。 It is the most primitive part of subconscious structure, the principal source of mental energy and the center of human instinct。