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Schizophrenic dementia. Clinical and computed axial tomography correlates
W B Lawson1, I N Waldman, D R Weinberger
1Clinical Brain Disorders Branch, National Institute of Mental Health, Saint Elizabeths Hospital, Washington, DC 20032.
The Journal of Nervous and Mental Disease
|April 1, 1988
Summary
Schizophrenia patients exhibit significant cognitive deficits on neuropsychological tests, including the Wechsler Adult Intelligence Scale and Halstead-Reitan Battery. Structural brain abnormalities, such as enlarged ventricles, correlate with poorer cognitive performance in schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia is a complex psychiatric disorder often associated with cognitive impairments.
- Previous research suggests a link between schizophrenia and deficits in various cognitive domains.
Purpose of the Study:
- To investigate cognitive performance in chronic schizophrenic patients compared to other psychiatric patients.
- To explore the relationship between structural brain abnormalities and cognitive function in schizophrenia.
Main Methods:
- Administered the Halstead-Reitan Battery (HRB) and Wechsler Adult Intelligence Scale (WAIS) to 27 schizophrenic and 9 matched psychiatric patients.
- Utilized computed axial tomography (CT) scans to assess brain structure (ventricle size, cortical atrophy).
- Correlated neuropsychological test scores with CT findings and psychopathology ratings (Brief Psychiatric Rating Scale).
Main Results:
- Schizophrenic patients showed significantly poorer performance on both WAIS and HRB compared to controls.
- Schizophrenics performed worse on all WAIS subtests and most HRB subtests, indicating widespread cognitive impairment.
- Enlarged ventricles in schizophrenic patients were associated with the worst cognitive scores.
- No correlation was found between cognitive performance and the severity of current psychopathology.
Conclusions:
- Cognitive impairment is a significant feature of schizophrenia, affecting multiple domains.
- Structural brain abnormalities, particularly enlarged ventricles, are associated with more severe cognitive deficits in schizophrenia.
- These findings support the hypothesis that schizophrenia involves a disease process affecting brain structure and cognitive function.