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In the study of psychology that says that psychology is the study of symptoms - symptoms of human behavior , in human behavior tigakah many phenomena that occur and many variants are there , because everyone has an different personalities . Man in pengruhi by id ego and super ego in Freud described his theory that :

- id = original personality , inborn .
-ego= develops from the id so that people are able to deal with reality ; thus the ego beroprasi follow the principles of the reality ; effort to obtain satisfaction in demand id with a new voltage prevent or delay the enjoyment to be found objects , which obviously can satisfy the needs .
- Superego = moral and ethical strength of personality , that operate using the principle ideaitik as opposed to the principle of satisfaction of the id and ego realitik principle .
                For example, when wanting a camera ( id ) think there is or is not the sort of camera to buy and choosing ( ego ) , and decided not to buy because there is no benefit even if the desire is not fulfilled ( super- ego ) .
                Well , , , a normal human being must have a desire that must be fulfilled to satisfy himself , but also to think just how important human and whether or not and whether to or not to use it . When many benefits will definitely always in usakahan to be memiliinya . Instances when a student wants to have developmental psychology book and thought the book was important then that he would try to get the book with any effort to get the book .
Normal humans have a desire to be able to satisfy her more , just to be able to distinguish between positive and negative fatherly .