title: Coupling between resting cerebral perfusion and EEG.
abstract: While several studies have investigated interactions between the electroencephalography (EEG) and functional magnetic resonance imaging BOLD signal fluctuations, less is known about the associations between EEG oscillations and baseline brain haemodynamics, and few studies have examined the link between EEG power outside the alpha band and baseline perfusion. Here we compare whole-brain arterial spin labelling perfusion MRI and EEG in a group of healthy adults (n = 16, ten females, median age: 27 years, range 21-48) during an eyes closed rest condition. Correlations emerged between perfusion and global average EEG power in low (delta: 2-4 Hz and theta: 4-7 Hz), middle (alpha: 8-13 Hz), and high (beta: 13-30 Hz and gamma: 30-45 Hz) frequency bands in both cortical and sub-cortical regions. The correlations were predominately positive in middle and high-frequency bands, and negative in delta. In addition, central alpha frequency positively correlated with perfusion in a network of brain regions associated with the modulation of attention and preparedness for external input, and central theta frequency correlated negatively with a widespread network of cortical regions. These results indicate that the coupling between average EEG power/frequency and local cerebral blood flow varies in a frequency specific manner. Our results are consistent with longstanding concepts that decreasing EEG frequencies which in general map onto decreasing levels of activation.
authors.affiliation: Center for MR-Research, University Children's Hospital Zurich, Steinwiesstrasse 75, CH-8032, Zurich, Switzerland.
authors.forename: R L
authors.initials: RL
authors.lastname: O'Gorman
authors.forename: S-S
authors.initials: SS
authors.lastname: Poil
authors.forename: D
authors.initials: D
authors.lastname: Brandeis
authors.forename: P
authors.initials: P
authors.lastname: Klaver
authors.forename: S
authors.initials: S
authors.lastname: Bollmann
authors.forename: C
authors.initials: C
authors.lastname: Ghisleni
authors.forename: R
authors.initials: R
authors.lastname: Lüchinger
authors.forename: E
authors.initials: E
authors.lastname: Martin
authors.forename: A
authors.initials: A
authors.lastname: Shankaranarayanan
authors.forename: D C
authors.initials: DC
authors.lastname: Alsop
authors.forename: L
authors.initials: L
authors.lastname: Michels
mesh_terms: D000328:Adult; D001931:Brain Mapping; D058256:Brain Waves / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D055420:Perfusion Imaging; D012146:Rest / Q000502:physiology*; D055815:Young Adult