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Task-related activations in heterotopic brain malformations: a PET study
R A Müller1, M E Behen, O Muzik
1Children's Hospital of Michigan, Department of Pediatrics, Wayne State University School of Medicine, Detroit 48201, USA.
Neuroreport
|August 29, 1998
Summary
Neuronal heterotopia, brain malformations, may participate in cognitive functions. Positron emission tomography (PET) revealed increased blood flow in heterotopic areas during cognitive tasks, suggesting functional roles.
Area of Science:
- Neuroscience
- Medical Imaging
- Cognitive Science
Background:
- Neuronal heterotopia are brain malformations with neurons in abnormal locations.
- Previous positron emission tomography (PET) studies indicate normal or elevated glucose metabolism in these areas.
- This raises questions about the potential involvement of heterotopic neurons in cognitive processes.
Purpose of the Study:
- To investigate the functional role of heterotopic neurons in cognitive processing.
- To determine if heterotopic brain regions show increased activity during specific cognitive tasks.
Main Methods:
- Studied three patients with heterotopic malformations.
- Utilized [(15)O]water PET to measure regional cerebral blood flow.
- Selected experimental conditions based on the location of the malformations.
Main Results:
- Task performance was associated with significant blood flow increases (>17%) within the heterotopia in all patients.
- In two patients, activations were observed in left frontal heterotopia during sentence generation.
- The third patient showed activations in a right posterior heterotopion during facial, visuospatial discrimination, and picture naming tasks.
Conclusions:
- Findings suggest that heterotopic neurons may participate in cognitive functions.
- The results imply that heterotopic neurons can form functional synapses with other brain regions.