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Neurocognitive Decrements are Present in Intellectually Superior Schizophrenia
Anja Vaskinn1, Torill Ueland2, Ingrid Melle3
1Department of Psychology, University of Oslo , Oslo , Norway ; NORMENT Centre of Excellence/K.G. Jebsen Centre for Psychosis Research, Oslo University Hospital , Oslo , Norway.
Frontiers in Psychiatry
|May 22, 2014
Summary
Intellectually superior individuals with schizophrenia (SZ) still experience neurocognitive deficits, comparable to those with average or low intelligence. These deficits are present even when their scores are within normal ranges, indicating a consistent impact of SZ across intellectual levels.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia (SZ) is often associated with neurocognitive deficits.
- However, some individuals with SZ and superior intelligence may not exhibit obvious cognitive impairments.
- This study examines neurocognitive decrements in intellectually superior SZ individuals.
Purpose of the Study:
- To investigate the presence and extent of neurocognitive decrements in intellectually superior individuals with schizophrenia (SZ).
- To compare the neuropsychological profiles of SZ cases and healthy controls (HC) across different intellectual levels.
- To determine if clinical characteristics and social functioning differ among SZ patients with varying intellectual strata.
Main Methods:
- Participants with SZ and HC were stratified into three IQ groups: low (80-95), normal (100-115), and superior (≥120).
- A repeated measures multivariate analysis of co-variance compared performance on eight neuropsychological tests between diagnostic groups and across IQ strata.
- Differences in clinical characteristics and social functioning were analyzed using multivariate and univariate analyses of variance.
Main Results:
- Intellectually superior SZ participants scored within normal limits but showed significant neurocognitive decrements compared to superior HC.
- The magnitude of these neurocognitive decrements was similar across low, normal, and superior IQ strata in SZ patients.
- No significant differences in functional impairments or clinical characteristics were observed among SZ participants across the IQ strata.
Conclusions:
- Neurocognitive decrements are a consistent feature of schizophrenia (SZ), present even in intellectually superior individuals.
- These findings support the classification of SZ as a neurocognitive disorder, irrespective of intellectual level.
- Similar social functioning deficits and clinical symptoms across intellectual strata suggest a common underlying disease process in SZ.
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