Why cant one approach explain all human behaviour?

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Why can’t one approach explain all human behaviour?

Freud’s’ theory of development based on the psychosexual stages proposes that adult behaviour is a direct consequence of how well individuals get through the stage sequence.  The stages follow a child’s development when an erogenous zone becomes their focus in accordance with their age and these include the mouth (breast feeding), anus (potty training), genitalia (recognition of different sexes) and the phallic (genitalia) stage where the Oedipus/Electra complex results in a child identifying with the same sex parent. Freud theorised that in order to have a normal personality as an adult the stages must be satisfactorily passed without fixation by overindulgence or frustration as this would result in undesirable characteristics such as vanity.  For example if a man appears too uptight and stingy this could be a result of anal retention because he gains pleasure from controlling as and when he goes to the toilet.

Freud believed that the id, ego and super-ego are parts of our psyche that develop during the psychosexual stages and are an ever changing dynamic that interact to influence our behaviours.  The id is our innate unconscious that thrives on the “pleasure principle” without societal restraints; it wants to be satisfied right now regardless of the consequences.  The ego develops between the ages of 2-3 during the anal stage and is part of both the conscious and unconscious because it represents the reality of obtaining the ids demands in a less selfish manner by playing the mediator role and the superego consists of a conscious that makes us feel guilt and remorse if we do something wrong and an ego-ideal that strives for perfection it is in absolute opposition of the ids demands.

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Ego defence mechanisms are unconscious or conscious attempts to protect the mind from extreme anxiety so that when traumatising events occur we push them into a compartment within our unconscious and do not have to outwardly deal with them.  Ego defence mechanisms include sublimation which involves diverting emotions into something not someone else for example losing your job and then putting all your time into running and exercising, another example is regression which is to basically revert to childish tactics when confronted with an overwhelming situations for example not being allowed to go out because your grounded so you sit ...

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