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Symptoms, cognitive and social functioning in recent-onset schizophrenia: a longitudinal study
A J Van der Does1, P M Dingemans, D H Linszen
1Department of Psychiatry, Leiden University, Leiden, The Netherlands.
Schizophrenia Research
|March 1, 1996
Summary
Schizophrenia symptom disorganization links to cognitive deficits. Negative symptoms show a complex, non-linear relationship with cognition, challenging their unitary concept in schizophrenia research.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia is characterized by complex symptom clusters.
- Cognitive deficits are a core feature of schizophrenia, impacting daily functioning.
- The relationship between specific symptom dimensions and cognitive performance requires further elucidation.
Purpose of the Study:
- To investigate the longitudinal relationships between schizophrenia symptoms and cognitive functioning over 15 months.
- To explore the association between negative symptoms and cognitive performance, testing the hypothesis of a unitary negative symptom concept.
- To identify potential cognitive vulnerability markers for schizophrenia.
Main Methods:
- Longitudinal study of patients with schizophrenia over 15 months.
- Cognitive assessments administered to schizophrenia patients, patients with mood disorders, and healthy controls.
- Analysis of correlations between symptom dimensions (disorganization, negative symptoms) and cognitive performance measures.
Main Results:
- Disorganization symptom dimension significantly correlated with cognitive performance in schizophrenia patients.
- No significant linear correlations were found between negative symptoms and cognitive performance across most measures.
- A curvilinear association between negative symptoms and cognitive performance was observed, suggesting heterogeneity.
- Speed of information processing and selective attention showed tentative evidence as vulnerability markers.
Conclusions:
- Disorganization appears to be a distinct symptom dimension in schizophrenia, directly impacting cognition.
- Negative symptoms in schizophrenia may not represent a unitary construct, exhibiting a complex relationship with cognitive abilities.
- Speed of information processing and selective attention warrant further investigation as potential neurocognitive markers for schizophrenia vulnerability.