Aetiology The psychodynamic theory originally purported by Sigmund Freud regards obsessions as defensive psychological responses to unconscious impulses. He focused on the mother-infant interaction, and considered issues of aggression and autonomy to be paramount around the time of toilet training when the child tries to withhold faecal masses while the mother persuades that he gives that up. Obsessive compulsive behaviours then are an expression of hostile impulses by the child against the mother. The development of obsessional symptoms in later life is seen as a regression to this earlier anal-sadistic phase in life. Freud further theorized the ego defences of reaction formation, isolation, displacement and undoing to control the patient's internal anxiety state.
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