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Symptom dimensions and cognitive and social functioning in recent-onset schizophrenia
A J Van der Does1, P M Dingemans, D H Linszen
1Department of Psychiatry, Leiden University, The Netherlands.
Psychological Medicine
|August 1, 1993
Summary
In recent-onset schizophrenia, disorganization and depressive symptoms impact cognition, while negative symptoms affect social functioning. Negative symptoms may have a complex, non-linear link with cognition.
Area of Science:
- Psychiatry
- Neuroscience
- Clinical Psychology
Background:
- Schizophrenia is a complex mental disorder characterized by diverse symptoms.
- Understanding the relationship between symptom clusters, cognitive deficits, and social impairment is crucial for effective treatment.
- Previous research has yielded mixed results regarding these associations, particularly concerning negative symptoms.
Purpose of the Study:
- To investigate the associations between specific symptom dimensions (positive, disorganization, depressive, negative) and cognitive/social functioning in recent-onset schizophrenia.
- To examine the validity of disorganization as a distinct symptom dimension.
- To explore potential linear and non-linear relationships between negative symptoms and cognitive measures.
Main Methods:
- Cross-sectional study involving 60 patients with recent-onset schizophrenia.
- Assessment of positive, disorganization, depressive, and negative symptoms.
- Evaluation of cognitive functioning using measures like Card Sorting.
- Assessment of social functioning.
Main Results:
- Positive symptoms were not associated with cognitive measures.
- Disorganization and depressive symptoms showed significant correlations with Card Sorting performance.
- Negative symptoms were significantly correlated with social functioning.
- No significant linear correlations were found between negative symptoms and cognitive measures, but a non-linear association was suggested for some cognitive tests.
Conclusions:
- The findings support disorganization as a separate symptom dimension in schizophrenia.
- Negative symptoms appear primarily linked to social functioning, with a potentially complex relationship to cognition.
- The results suggest that negative symptoms in schizophrenia may not be a unitary concept and warrant further investigation using non-linear models.