Medicine:Schizotypal personality disorder

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Short description: Schizophrenia-spectrum disorder
Schizotypal disorder
Symptomsstrange thinking or behavior, unusual beliefs, paranoia, severe anxiety, lack of friends
ComplicationsSchizophrenia, Substance use disorder, Major Depressive Disorder
Risk factorsFamily history
Differential diagnosisCluster A personality disorders, borderline personality disorder, avoidant personality disorder, autism spectrum disorder, social anxiety disorder, ADHD-PI (ADD)
Frequencyestimated 3% of general population

Schizotypal personality disorder (STPD), also known as schizotypal disorder, is a mental and behavioural disorder. [1] DSM classification describes the disorder specifically as a personality disorder characterized by thought disorder, paranoia, a characteristic form of social anxiety, derealization, transient psychosis, and unconventional beliefs. People with this disorder feel pronounced discomfort in forming and maintaining social connections with other people, primarily due to the belief that other people harbour negative thoughts and views about them. Peculiar speech mannerisms and socially unexpected modes of dress are also characteristic. Schizotypal people may react oddly in conversations, not respond, or talk to themselves.[2] They frequently interpret situations as being strange or having unusual meaning for them; paranormal and superstitious beliefs are common. Schizotypal people usually disagree with the suggestion their thoughts and behaviour are a 'disorder', and seek medical attention for depression or anxiety instead.[3] Schizotypal personality disorder occurs in approximately 3% of the general population and is more common in males.[4]

The term "schizotype" was first coined by Sandor Rado in 1956 as an abbreviation of "schizophrenic phenotype".[5] STPD is classified as a cluster A personality disorder, also known as the "odd or eccentric" cluster.



Schizotypal personality disorder is widely understood to be a "schizophrenia spectrum" disorder. Rates of schizotypal personality disorder are much higher in relatives of individuals with schizophrenia than in the relatives of people with other mental illnesses or in people without mental illness. Technically speaking, schizotypal personality disorder may also be considered an "extended phenotype" that helps geneticists track the familial or genetic transmission of the genes that are implicated in schizophrenia pathogenesis.[6] But there is also a genetic connection of STPD to mood disorders and depression in particular.[7]

Social and environmental

There is now evidence to suggest that parenting styles, early separation, trauma/maltreatment history (especially early childhood neglect) can lead to the development of schizotypal traits.[8][9] Neglect or abuse, trauma, or family dysfunction during childhood may increase the risk of developing schizotypal personality disorder. Over time, children learn to interpret social cues and respond appropriately but for unknown reasons this process does not work well for people with this disorder.[10]

Schizotypal personality disorders are characterized by a common attentional impairment in various degrees that could serve as a marker of biological susceptibility to STPD.[11] The reason is that an individual who has difficulties taking in information may find it difficult in complicated social situations where interpersonal cues and attentive communications are essential for quality interaction. This might eventually cause the individual to withdraw from most social interactions, thus leading to asociality.[11]



In the American Psychiatric Association's DSM-5, schizotypal personality disorder is defined as a "pervasive pattern of social and interpersonal deficits marked by acute discomfort with, and reduced capacity for, close relationships as well as by cognitive or perceptual distortions and eccentricities of behavior, beginning by early adulthood and present in a variety of contexts."[3]

At least five of the following symptoms must be present:

  • ideas of reference
  • strange beliefs or magical thinking that influences behavior and is inconsistent with subcultural norms (e.g., superstitiousness, belief in clairvoyance, telepathy, or “sixth sense”, bizarre fantasies or preoccupations)
  • abnormal perceptual experiences, including bodily illusions
  • strange thinking and speech (e.g., vague, circumstantial, metaphorical, overelaborate, or stereotyped)
  • suspiciousness or paranoid ideation
  • inappropriate or constricted affect
  • strange behavior or appearance
  • lack of close friends
  • excessive social anxiety that does not diminish with familiarity and tends to be associated with paranoid fears rather than negative judgments about self

These symptoms must not occur only during the course of a disorder with similar symptoms (such as schizophrenia or autism spectrum disorder).[3]


The World Health Organization's ICD-10 uses the name schizotypal disorder (F21). It is classified as a clinical disorder associated with schizophrenia, rather than a personality disorder as in DSM-5.[12]

The ICD definition is:

A disorder characterized by eccentric behavior and anomalies of thinking and affect which resemble those seen in schizophrenia, though no definite and characteristic schizophrenic anomalies have occurred at any stage. There is no dominant or typical disturbance, but any of the following may be present:
  • Inappropriate or constricted affect (the individual appears cold and aloof);
  • Behavior or appearance that is odd, eccentric or peculiar;
  • Poor rapport with others and a tendency to withdraw socially;
  • Odd beliefs or magical thinking, influencing behavior and inconsistent with subcultural norms;
  • Suspiciousness or paranoid ideas;
  • Obsessive ruminations without inner resistance;
  • Unusual perceptual experiences including somatosensory (bodily) or other illusions, depersonalization or derealization;
  • Vague, circumstantial, metaphorical, over-elaborate or stereotyped thinking, manifested by odd speech or in other ways, without gross incoherence;
  • Occasional transient quasi-psychotic episodes with intense illusions, auditory or other hallucinations and delusion-like ideas, usually occurring without external provocation.
The disorder runs a chronic course with fluctuations of intensity. Occasionally it evolves into overt schizophrenia. There is no definite onset and its evolution and course are usually those of a personality disorder. It is more common in individuals related to people with schizophrenia and is believed to be part of the genetic "spectrum" of schizophrenia.

Diagnostic guidelines

This diagnostic rubric is not recommended for general use because it is not clearly demarcated either from simple schizophrenia or from schizoid or paranoid personality disorders, or possibly autism spectrum disorders as currently diagnosed. If the term is used, three or four of the typical features listed above should have been present, continuously or episodically, for at least 2 years. The individual must never have met criteria for schizophrenia itself. A history of schizophrenia in a first-degree relative gives additional weight to the diagnosis but is not a prerequisite.


Theodore Millon proposes two subtypes of schizotypal personality.[5][13] Any individual with schizotypal personality disorder may exhibit either one of the following somewhat different subtypes (Note that Millon believes it is rare for a personality with one pure variant, but rather a mixture of one major variant with one or more secondary variants):

Subtype Description Personality traits
Insipid schizotypal A structural exaggeration of the passive-detached pattern. It includes schizoid, depressive and dependent features. Sense of strangeness and nonbeing; overtly drab, sluggish, inexpressive; internally bland, barren, indifferent, and insensitive; obscured, vague, and tangential thoughts.
Timorous schizotypal A structural exaggeration of the active-detached pattern. It includes avoidant and negativistic features. Warily apprehensive, watchful, suspicious, guarded, shrinking, deadens excess sensitivity; alienated from self and others; intentionally blocks, reverses, or disqualifies own thoughts.



STPD is rarely seen as the primary reason for treatment in a clinical setting, but it often occurs as a comorbid finding with other mental disorders. When patients with STPD are prescribed pharmaceuticals, they are usually prescribed neuroleptics of the sort used to treat schizophrenia; however, the use of neuroleptic drugs in the schizotypal population is in great doubt.[14] While people with schizotypal personality disorder and other attenuated psychotic-spectrum disorders may have a good outcome with neuroleptics in the short term, long-term followup suggests significant impairment in daily functioning compared to schizotypal and even schizophrenic people without neuroleptic drug exposure.[15] Antidepressants are also sometimes prescribed, whether for STPD proper or for comorbid anxiety and depression.[14]


According to Theodore Millon, the schizotypal is one of the easiest personality disorders to identify but one of the most difficult to treat with psychotherapy.[5] Persons with STPD usually consider themselves to be simply eccentric or nonconformist; the degree to which they consider their social nonconformity a problem and the degree to which psychiatry does differ. It is difficult to gain rapport with people who suffer from STPD due to the fact that increasing familiarity and intimacy usually increase their level of anxiety and discomfort.[16]

Group therapy is recommended for persons with STPD only if the group is well structured and supportive. Otherwise, it could lead to loose and tangential ideation.[clarification needed][14] Support is especially important for schizotypal patients with predominant paranoid symptoms, because they will have a lot of difficulties even in highly structured groups.[17]


Schizotypal personality disorder frequently co-occurs with major depressive disorder, dysthymia and social phobia.[18] Furthermore, sometimes schizotypal personality disorder can co-occur with obsessive–compulsive disorder, and its presence appears to affect treatment outcome adversely.[19] There may also be an association with bipolar disorder.[20]

In terms of comorbidity with other personality disorders, schizotypal personality disorder has high comorbidity with schizoid and paranoid personality disorder, the other two 'Cluster A' conditions.[21] It also has significant comorbidity with borderline personality disorder and narcissistic personality disorder.[20]

Some schizotypal people go on to develop schizophrenia,[22] but most of them do not.[23] There are dozens of studies showing that individuals with schizotypal personality disorder score similar to individuals with schizophrenia on a very wide range of neuropsychological tests. Cognitive deficits in patients with schizotypal personality disorder are very similar to, but quantitatively milder than, those for patients with schizophrenia.[24] A 2004 study, however, reported neurological evidence that did "not entirely support the model that SPD is simply an attenuated form of schizophrenia".[25]


Reported prevalence of STPD in community studies ranges from 0.6% in a Norway sample, to 4.6% in an United States sample.[3] A large American study found a lifetime prevalence of 3.9%, with somewhat higher rates among men (4.2%) than women (3.7%).[4] It may be uncommon in clinical populations, with reported rates of up to 1.9%.[3]

Together with other cluster A personality disorders, it is also very common among homeless people who show up at drop-in centres, according to a 2008 New York study. The study did not address homeless people who do not show up at drop-in centres.[26]

See also


  1. Drs; Sartorius, Norman; Henderson, A.S.; Strotzka, H.; Lipowski, Z.; Yu-cun, Shen; You-xin, Xu; Strömgren, E.; Glatzel, J. et al.. "The ICD-10 Classification of Mental and Behavioural Disorders Clinical descriptions and diagnostic guidelines". Microsoft Word. pp. 77, 83-4. 
  2. Schacter, Daniel L., Daniel T. Gilbert, and Daniel M. Wegner. Psychology. Worth Publishers, 2010. Print.
  3. 3.0 3.1 3.2 3.3 3.4 Diagnostic and statistical manual of mental disorders : DSM-5. American Psychiatric Association, American Psychiatric Association. 2013. pp. 655–659. ISBN 978-0-89042-555-8. OCLC 830807378. 
  4. 4.0 4.1 Pulay, AJ; Stinson, FS; Dawson, DA; Goldstein, RB; Chou, SP et al. (2009). "Prevalence, Correlates, Disability, and Comorbidity of DSM-IV Schizotypal Personality Disorder: Results From the Wave 2 National Epidemiologic Survey on Alcohol and Related Conditions". Primary Care Companion to the Journal of Clinical Psychiatry 11 (2): 53–67. doi:10.4088/PCC.08m00679. PMID 19617934. 
  5. 5.0 5.1 5.2 Millon, Theodore (2004). "Chapter 12 – The Schizotypal Personality". Personality disorders in modern life. Wiley. p. 403. ISBN 978-0-471-23734-1. OCLC 57291241. 
  6. Fogelson, D.L; Nuechterlein, K.H.; Asarnow, R.A.; Payne, D.L.; Subotnik, K.L.; Jacobson, K.C.; Neale, M.C.; Kendler, K.S. (15 February 2007). "Avoidant personality disorder is a separable schizophrenia-spectrum personality disorder even when controlling for the presence of paranoid and schizotypal personality disorders". Schizophrenia Research (Elsevier BV) 91 (1–3): 192–199. doi:10.1016/j.schres.2006.12.023. ISSN 0920-9964. PMID 17306508. 
  7. Comer, Ronald; Comer, Gregory. "Personality Disorders". Princeton University. 
  8. Deidre M. Anglina, Patricia R. Cohenab, Henian Chena (2008) Duration of early maternal separation and prediction of schizotypal symptoms from early adolescence to midlife, Schizophrenia Research Volume 103, Issue 1, Pages 143–150 (August 2008)
  9. Howard Berenbaum, Ph.D., Eve M. Valera, Ph.D. and John G. Kerns, Ph.D. (2003) Psychological Trauma and Schizotypal Symptoms, Oxford Journals, Medicine, Schizophrenia Bulletin Volume 29, Number 1 Pp. 143–152
  10. Mayo Clinic Staff. "Schizotypal personality disorder". Mayo Clinic. 
  11. 11.0 11.1 Roitman, SE; Cornblatt, BA; Bergman, A; Obuchowski, M; Mitropoulou, V; Keefe, RS; Silverman, JM; Siever, LJ (1997). "Attentional functioning in schizotypal personality disorder [published erratum appears in Am J Psychiatry 1997 Aug;154(8):1180]". The American Journal of Psychiatry 154 (5): 655–660. doi:10.1176/ajp.154.5.655. ISSN 0002-953X. PMID 9137121. 
  12. Schizotypal Disorder in ICD-10: Clinical descriptions and guidelines.
  13. The Millon Personality Group (8 March 2017). "Eccentric/Schizotypal Personality". 
  14. 14.0 14.1 14.2 Livesley, W (2001). Handbook of personality disorders : theory, research, and treatment. Guilford Press. ISBN 978-1-57230-629-5. OCLC 45750508. 
  15. "A 20-Year Multi-Followup Longitudinal Study Assessing Whether Antipsychotic Medications Contribute to Work Functioning in Schizophrenia". Psychiatry Research 256: 267–274. 2017. doi:10.1016/j.psychres.2017.06.069. PMID 28651219. 
  16. Siever, L.J. (1992). "Schizophrenia spectrum disorders". Review of Psychiatry 11: 25–42. 
  17. Oldham, John (2005). The American Psychiatric Publishing textbook of personality disorders. American Psychiatric Pub. ISBN 978-1-58562-159-0. OCLC 56733258. 
  18. Sutker, Patricia (2002). Comprehensive handbook of psychopathology (3rd ed.). Kluwer Academic. ISBN 978-0-306-46490-4. OCLC 50322422. 
  19. Murray, Robin (2008). Essential psychiatry (4th ed.). Cambridge University Press. ISBN 978-0-521-60408-6. OCLC 298067373. 
  20. 20.0 20.1 "Prevalence, Correlates, Disability, and Comorbidity of DSM-IV Schizotypal Personality Disorder: Results From the Wave 2 National Epidemiologic Survey on Alcohol and Related Conditions". Primary Care Companion to the Journal of Clinical Psychiatry 11 (2): 53–67. 2009. doi:10.4088/pcc.08m00679. PMID 19617934. 
  21. Tasman, Allan (2008). Psychiatry (3rd ed.). Wiley-Blackwell. ISBN 978-0-470-06571-6. OCLC 264703257. 
  22. Walker, Elaine; Kestler, Lisa; Bollini, Annie et al. (2004). "Schizophrenia: Etiology and Course". Annual Review of Psychology (Annual Reviews) 55 (1): 401–430. doi:10.1146/annurev.psych.55.090902.141950. ISSN 0066-4308. PMID 14744221. 
  23. Raine, A. (2006). "Schizotypal personality: Neurodevelopmental and psychosocial trajectories". Annual Review of Psychology 2: 291–326. doi:10.1146/annurev.clinpsy.2.022305.095318. PMID 17716072. 
  24. Matsui, Mié; Sumiyoshi, Tomiki; Kato, Kanade et al. (2004). "Neuropsychological Profile in Patients with Schizotypal Personality Disorder or Schizophrenia". Psychological Reports (SAGE Publications) 94 (2): 387–397. doi:10.2466/pr0.94.2.387-397. ISSN 0033-2941. PMID 15154161. 
  25. Haznedar, M. M.; Buchsbaum, M. S.; Hazlett, E. A.; Shihabuddin, L.; New, A.; Siever, L. J. (2004). "Cingulate gyrus volume and metabolism in the schizophrenia spectrum". Schizophrenia Research 71 (2–3): 249–262. doi:10.1016/j.schres.2004.02.025. PMID 15474896. 
  26. Connolly, Adrian J. (2008). "Personality disorders in homeless drop-in center clients". Journal of Personality Disorders 22 (6): 573–588. doi:10.1521/pedi.2008.22.6.573. PMID 19072678. 

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