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Is it possible to be schizophrenic yet neuropsychologically normal?
B W Palmer1, R K Heaton, J S Paulsen
1Department of Psychiatry, University of California, San Diego, USA.
Neuropsychology
|July 1, 1997
Summary
A significant portion of individuals with schizophrenia exhibit normal neuropsychological functioning. This finding suggests distinct underlying causes for cognitive deficits and core psychiatric symptoms in schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Psychology
Background:
- Schizophrenia is often associated with significant neuropsychological (NP) deficits.
- The relationship between cognitive impairment and core psychiatric features in schizophrenia requires further elucidation.
Purpose of the Study:
- To identify and characterize schizophrenic patients who do not exhibit neuropsychological impairment.
- To explore the clinical and demographic differences between NP-normal and NP-impaired schizophrenic patients.
Main Methods:
- Administered a comprehensive NP battery to 171 schizophrenic outpatients and 63 healthy controls.
- Classified NP status via blind clinical ratings by two experienced neuropsychologists.
Main Results:
- 27% of schizophrenic patients were classified as NP-normal.
- NP-normal schizophrenics showed fewer negative and extrapyramidal symptoms, less anticholinergic medication use, and better social functioning.
- NP-normal patients were less likely to have had recent psychiatric hospitalization.
Conclusions:
- The existence of NP-normal individuals within the schizophrenia spectrum suggests heterogeneity in the disorder's pathophysiology.
- Cognitive deficits in schizophrenia may stem from pathological processes distinct from those causing core psychiatric features.