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Hypofrontality revisited: a high resolution single photon emission computed tomography study in schizophrenia
K P Ebmeier1, S M Lawrie, D H Blackwood
1MRC Brain Metabolism Unit, Royal Edinburgh Hospital, Morningside Park, UK.
Journal of Neurology, Neurosurgery, and Psychiatry
|April 1, 1995
Summary
Generalized hypofrontality is not a feature of schizophrenia. This study found increased prefrontal cortex activity in actively psychotic patients not taking medication, challenging established findings on schizophrenia brain activity.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Hypofrontality, or reduced prefrontal cortex activity, is widely cited in schizophrenia research.
- Previous studies often suffer from bias due to small sample sizes or patient performance during activation tasks.
Purpose of the Study:
- To investigate prefrontal cortex activity in schizophrenia patients at rest.
- To address limitations of previous studies by using a larger sample and resting-state imaging.
Main Methods:
- Single photon emission computed tomography (SPECT) with 99mTc-exametazime was used.
- Seventy patients with non-affective psychoses (60 with schizophrenia/schizophreniform disorder) and 20 healthy controls were recruited.
- Tracer uptake was measured at rest and normalized to the occipital cortex.
Main Results:
- Actively psychotic patients not on medication showed increased prefrontal cortex uptake.
- Schizophrenia patients on medication exhibited reduced mesial frontal cortex uptake.
- Patients displayed relatively increased prefrontal and decreased mesial frontal uptake compared to controls.
Conclusions:
- Generalized hypofrontality is not characteristic of schizophrenia patients at rest.
- Medication status significantly influences prefrontal and mesial frontal cortex activity in schizophrenia.
- Findings challenge the established view of hypofrontality in schizophrenia.