Positive and negative symptoms in the psychoses: Multidimensional scaling of SAPS and SANS items

Recently, the validity of the simple dichotomy between positive and negative symptoms in psychosis has been questioned. A newly admitted group of 114 DSM-III patients with psychotic disorder were assessed using Andreasen's positive and negative symptom scales. Multidimensional scaling, augmente...

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Bibliographic Details
Published in:Schizophrenia research 1992-12, Vol.8 (2), p.143-156
Main Authors: Minas, I.H., Stuart, G.W., Klimidis, S., Jackson, H.J., Singh, B.S., Copolov, D.L.
Format: Article
Language:English
Subjects:
Adult
Adult and adolescent clinical studies
Biological and medical sciences
Delusions - diagnosis
Delusions - psychology
Female
Hallucinations - diagnosis
Hallucinations - psychology
Hospitalization
Humans
Male
Medical sciences
Multidimensional scaling
Positive and negative symptoms
Psychiatric Status Rating Scales - statistics & numerical data
Psychology. Psychoanalysis. Psychiatry
Psychometrics
Psychopathology. Psychiatry
Psychoses
Psychosis
Psychotic Disorders - classification
Psychotic Disorders - diagnosis
Psychotic Disorders - psychology
Schizophrenia
Schizophrenia - classification
Schizophrenia - diagnosis
Schizophrenic Psychology
Thinking
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Summary:Recently, the validity of the simple dichotomy between positive and negative symptoms in psychosis has been questioned. A newly admitted group of 114 DSM-III patients with psychotic disorder were assessed using Andreasen's positive and negative symptom scales. Multidimensional scaling, augmented by cluster analysis, was applied to the full item set of these scales and showed clearly that there are three major, independent groups of symptoms: Hallucinations/Delusions, Positive Thought Disorder and Negative Symptoms. Within the Hallucinations/Delusions and Negative Symptoms groups there was some additional structure which does not conform to the SAPS and SANS sub-scales. In particular there was considerable heterogeneity within the Hallucinations/Delusions group, and delusions of persecution may represent a fourth independent dimension of psychopathology which is under-represented in these scales.
ISSN:0920-9964
1573-2509
DOI:10.1016/0920-9964(92)90031-Y