AI Article Synopsis
- The study investigates the link between GABAA/benzodiazepine receptor binding and cognitive function in schizophrenia using advanced imaging techniques.
- Results indicate that lower receptor binding correlates with worse performance on cognitive tasks in individuals with schizophrenia compared to non-psychiatric controls.
- The findings point to a potential role of GABA in cognitive deficits associated with schizophrenia, suggesting directions for future research to further explore this relationship.
Article Abstract
Background: The role of the inhibitory neurotransmitter gamma aminobutyric acid (GABA) in schizophrenia has previously been investigated using postmortem material. Recently, using single photon emission tomography (SPET) with the selective benzodiazepine antagonist 123I-Iomazenil as the radioligand, we have demonstrated an in vivo relationship between reduced GABAA/benzodiazepine receptor binding and the severity of positive symptomatology in schizophrenia. The present study aimed to build on this using the same in vivo scanning techniques, and relating findings to cognitive functioning.
Methods: Ten nonpsychiatric control subjects and 15 schizophrenic patients, matched for age and handedness, were scanned. A battery of neuropsychologic tests was also administered.
Results: Correlational analysis revealed a pattern of increased correlations between GABAA/benzodiazepine receptor binding and task performance, in the schizophrenic group compared to the control group.
Conclusions: Findings are preliminary but suggest a relationship between reduced GABAA/benzodiazepine receptor binding and poorer cognitive functioning, involving memory and visual attention processes, in the schizophrenic group but not in the control group. A role for GABA in the pathophysiology of schizophrenia is suggested. Limitations of the present study and suggestions for future research are discussed.
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| http://dx.doi.org/10.1016/s0006-3223(97)00300-4 | DOI Listing |
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