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A Psychopathological Study of Latent (Early) Schizophrenia: Clinical Pathology/Neuropsychological Dysfunctions

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00155519
Recruitment Status : Completed
First Posted : September 12, 2005
Last Update Posted : November 28, 2005
Information provided by:
National Taiwan University Hospital

Brief Summary:

Current diagnostic criteria of schizophrenia are based on marked positive and negative symptoms. This definition may impede the exploration of basic phenomenological psychopathology or pathological mechanism of schizophrenia. Schizophrenia was found to have neuroanatomical, neurophysiological and neuropsychological impairment. However, the existence of these basic pathological states may not manifest as clinical state of schizophrenia, and it is found in normal relatives of schizophrenia proband. The clinical state of this underlying pathology may include so-called latent or early, or pseudo-neurotic schizophrenia or schizotypal disorder. The manifestation of prominent neurotic symptom state may not only present as an psychopathological issue, but also induce misdiagnosis in clinical practice. This may interfere early diagnosis of schizophrenia and may delay the chance of early and appropriate treatment.

Taking the fact of this disadvantaged conditions, this research is for exploration of clinical pathology and neuropsychological functions of latent or pseudo-neurotic schizophrenia. The strategy ia a natural follow-up study on the clinical cases obtained from the registration record of the medical charts of the National Taiwan University Hospital from 1970 to 1995. The natural follow-up results till study time (5 yrs to 30 yrs following period) will be explored. By using neurotic group (50 cases), latent schizophrenia group (50 cases) and schizotypal group (30 cases), the differences in clinical pathology, neuropsychological functions and family history of schizophrenia will be examined. There are 5 hypotheses to be tested: (1) Schizotaxia may exist as the manifestations of latent schizophrenia, schizotypal disorder and frank schizophrenia. The severity of pathology increased step by step; (2) The syndrome may change from the lower order to higher order to higher order, but not all of them changed to the higher order; (3) The clinical pathology of latent schizophrenia has both neurotic symptom as well as basic symptoms of schizophrenia; (4) There is the same kind of neuropsychological impairment of schizophrenia in the group of latent schizophrenia, and (5) The prevalence of schizophrenia in the first degree relatives of latent schizophrenia is higher than that of the general population. Finally, this study results will help the establishment of valid screening and/or diagnostic method (criteria) of latent schizophrenia for clinical and research usage.

Condition or disease
Schizophrenia Latent Schizophrenia

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Study Type : Observational
Enrollment : 130 participants
Observational Model: Defined Population
Time Perspective: Longitudinal
Time Perspective: Retrospective/Prospective
Official Title: A Psychopathological Study of Latent (Early) Schizophrenia: Clinical Pathology/Neuropsychological Dysfunctions
Study Start Date : July 2002
Study Completion Date : July 2002

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Schizophrenia

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Schizophrenia
  • Latent Schizophrenia

Exclusion Criteria:


Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00155519

Sponsors and Collaborators
National Taiwan University Hospital
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Principal Investigator: Hai-Gwo Hwu, Professor National Taiwan University

Layout table for additonal information Identifier: NCT00155519     History of Changes
Other Study ID Numbers: 10892
First Posted: September 12, 2005    Key Record Dates
Last Update Posted: November 28, 2005
Last Verified: August 2000
Keywords provided by National Taiwan University Hospital:
Latent Schizophrenia
Schizotypal Disorder
Neuropsychological Function
Family History
basic symptoms
Additional relevant MeSH terms:
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Schizotypal Personality Disorder
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Personality Disorders