REVIEW ARTICLE |
Academic Department of Psychiatry, University of Sheffield, UK
Correspondence: Dr Sean A. Spence, Reader in General Adult Psychiatry, Academic Department of Psychiatry, University of Sheffield, The Longley Centre, Norwood Grange Drive, Sheffield S5 7JT, UK. Tel: +44 (0) 114 22 61519; fax: +44 (0) 114 22 61522; e-mail: S.A.Spence{at}Sheffield.ac.uk
Background Thought insertion is commonly regarded as diagnostic of schizophrenia. Little is known of its aetiology or pathophysiology.
Aims To examine the definition and application of thought insertion in psychiatric and allied literatures.
Method A semi-structured literature review and conceptual analysis.
Results When narrowly defined, thought insertion is reliably identified but not specific to schizophrenia. There is a range of related phenomena (alienated, influenced, made and passivity thinking), less consistently defined but also not specific to schizophrenia. Whether thought insertion is solely an abnormal belief (or may also be an experience) is open to question. Nevertheless, the symptom has been used to explain schizophrenia, predict dangerousness and advance theories of normal agency. Most applications have been subject to critique.
Conclusions Despite its widespread occurrence and diagnostic application, thought insertion is an ill-understood and underresearched symptom of psychosis. Its pathophysiology remains obscure.
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