Publication

The relation between the general intellect of schizophrenic patients and psychopathological deterioration

2009
Conference Papers

Abstract

Objectives: The aim of the study was to examine whether the postpsychotic decline in IQ during schizophrenia coincides with psychopathological deterioration or it is a state-independent premorbid impairment. Methods: The IQ score of 32 schizophrenic patients and 25 normal comparison subjects were evaluated three times during an average of 4,5 years, after short (mean 2,3 years) and long (mean 4,6) follow-up periods. The results were examined and related to changes of negative and positive symptoms of the illness. Results: The schizophrenic group had lower IQ score at baseline than the normal comparison subjects but showed comparable stability over time. The total IQ score slightly increased in both groups in follow-up period. No significant correlations were found between IQ score changes and, improvement or worsening of the clinical symptoms. Conclusions: The IQ score of patients with schizophrenia appears to remain stable regardless of psychopathological decline, and even could be improved by learning and rehearsal.

Official source

https://infoscience.epfl.ch/entities/publication/5306e10f-2836-4a9d-acfc-d649c111b812

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2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5306e10f-2836-4a9d-acfc-d649c111b812

About this result

Related concepts (30)

Intelligence quotient

An intelligence quotient (IQ) is a total score derived from a set of standardised tests or subtests designed to assess human intelligence. The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in a 1912 book. Historically, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.

IQ classification

IQ classification is the practice of categorizing human intelligence, as measured by intelligence quotient (IQ) tests, into categories such as "superior" or "average". In the current IQ scoring method, an IQ score of 100 means that the test-taker's performance on the test is of average performance in the sample of test-takers of about the same age as was used to norm the test. An IQ score of 115 means performance one standard deviation above the mean, while a score of 85 means performance one standard deviation below the mean, and so on.

Schizophrenia

Schizophrenia is a mental disorder characterized by continuous or relapsing episodes of psychosis. Major symptoms include hallucinations (typically hearing voices), delusions, and disorganized thinking. Other symptoms include social withdrawal, and flat affect. Symptoms typically develop gradually, begin during young adulthood, and in many cases never become resolved. There is no objective diagnostic test; diagnosis is based on observed behavior, a psychiatric history that includes the person's reported experiences, and reports of others familiar with the person.