Coupling of theta activity and glucose metabolism in the human rostral anterior cingulate cortex: an EEG/PET study of normal and depressed subjects.
In rodents, theta rhythm has been linked to the hippocampal formation, as well as other regions, including the anterior cingulate cortex (ACC). To test the role of the ACC in theta rhythm, concurrent measurements of brain electrical activity (EEG) and glucose metabolism (PET) were performed in 29 subjects at baseline. EEG data were analyzed with a source localization technique that enabled voxelwise correlations of EEG and PET data. For theta, but not other bands, the rostral ACC (Brodmann areas 24/32) was the largest cluster with positive correlations between current density and glucose metabolism. Positive correlations were also found in right fronto-temporal regions. In control but not depressed subjects, theta within ACC and prefrontal/orbitofrontal regions was positively correlated. The results reveal a link between theta and cerebral metabolism in the ACC as well as disruption of functional connectivity within frontocingulate pathways in depression.
Pizzagalli
Diego A
DA
Department of Psychology, Harvard University, Cambridge, Massachusetts, USA.
Oakes
Terrence R
TR
Davidson
Richard J
RJ
D000328:Adult; D001923:Brain Chemistry / Q000502:physiology*; D002540:Cerebral Cortex / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000502:physiology*; D003627:Data Interpretation, Statistical; D003866:Depressive Disorder / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000503:physiopathology*; D004569:Electroencephalography; D005260:Female; D019788:Fluorodeoxyglucose F18; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D019275:Radiopharmaceuticals; D013826:Theta Rhythm; D014055:Tomography, Emission-Computed
D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D005947:Glucose