Obsessions are abnormal mental compulsions. They are experiences with a compelling quality which persistently intrude into consciousness. Though recognized by the patient as an irrational product of his own mind and resisted by him, they are incapable of being expelled. They may be thoughts, images, fears, urges, or acts. An obsessional disorder is one where such symptoms dominate the clinical picture and are not associated with any underlying psychosis.
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Linton Grimshaw (1965) studied this question.
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