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Attenuated frontal activation during a verbal fluency task in patients with schizophrenia
V A Curtis1, E T Bullmore, M J Brammer
1Department of Psychological Medicine, Institute of Psychiatry, London, United Kingdom. v.curtis@kcl.ac.uk
The American Journal of Psychiatry
|August 12, 1998
Summary
Schizophrenic patients show altered brain activity during verbal tasks, with reduced frontal lobe responses but increased parietal lobe activity. This functional magnetic resonance imaging (fMRI) study highlights key differences in brain function.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Schizophrenia is a complex mental disorder affecting cognition.
- Understanding brain activity during cognitive tasks is crucial for schizophrenia research.
Purpose of the Study:
- To investigate changes in cerebral blood oxygenation using functional magnetic resonance imaging (fMRI) in schizophrenic patients during a verbal fluency task.
- To compare brain activation patterns between schizophrenic patients and healthy controls.
Main Methods:
- fMRI scans were conducted on five male schizophrenic patients and five healthy controls during a verbal fluency task and a rest condition.
- Brain activation maps were generated using sinusoidal regression and non-parametric hypothesis testing.
- Analysis of covariance controlled for motion artifacts to compare group differences.
Main Results:
- Healthy controls showed significant activation in the left prefrontal cortex, insula, supplementary motor area, and medial parietal cortex.
- Schizophrenic patients exhibited reduced activation in the left dorsal prefrontal cortex, inferior frontal gyrus, and insula.
- Schizophrenic patients showed increased activation in the medial parietal cortex compared to controls.
Conclusions:
- Schizophrenic patients display attenuated frontal lobe responses during word generation.
- Increased medial parietal cortex activity was observed in schizophrenic patients during word repetition.
- These findings suggest distinct patterns of brain activation in schizophrenia.