TY - JOUR
T1 - EEG-correlated fMRI of human alpha activity
AU - Laufs, H.
AU - Kleinschmidt, A.
AU - Beyerle, A.
AU - Eger, E.
AU - Salek-Haddadi, A.
AU - Preibisch, C.
AU - Krakow, K.
N1 - Funding Information:
H.L., E.E., and A.K. were funded by the Volkswagen Stiftung and K.K. by the Medical Faculty of the Johann Wolfgang Goethe-University, Frankfurt. The MRI-compatible EEG system was sponsored by the German Ministry for Education and Research (BmBF). We thank the Institute of Neuroradiology for scanner access and all volunteers for participation.
PY - 2003/8/1
Y1 - 2003/8/1
N2 - Electroencephalography-correlated functional magnetic resonance imaging (EEG/fMRI) can be used to identify blood oxygen level-dependent (BOLD) signal changes associated with both physiological and pathological EEG events. Here, we implemented continuous and simultaneous EEG/fMRI to identify BOLD signal changes related to spontaneous power fluctuations in the alpha rhythm (8-12 Hz), the dominant EEG pattern during relaxed wakefulness. Thirty-two channels of EEG were recorded in 10 subjects during eyes-closed rest inside a 1.5-T magnet resonance (MR) scanner using an MR-compatible EEG recording system. Functional scanning by echoplanar imaging covered almost the entire cerebrum every 4 s. Off-line MRI artifact subtraction software was applied to obtain continuous EEG data during fMRI acquisition. The average alpha power over 1-s epochs was derived at several electrode positions using a Fast Fourier Transform. The power time course was then convolved with a canonical hemodynamic response function, down-sampled, and used for statistical parametric mapping of associated signal changes in the image time series. At all electrode positions studied, a strong negative correlation of parietal and frontal cortical activity with alpha power was found. Conversely, only sparse and nonsystematic positive correlation was detected. The relevance of these findings is discussed in view of the current theories on the generation and significance of the alpha rhythm and the related functional neuroimaging findings.
AB - Electroencephalography-correlated functional magnetic resonance imaging (EEG/fMRI) can be used to identify blood oxygen level-dependent (BOLD) signal changes associated with both physiological and pathological EEG events. Here, we implemented continuous and simultaneous EEG/fMRI to identify BOLD signal changes related to spontaneous power fluctuations in the alpha rhythm (8-12 Hz), the dominant EEG pattern during relaxed wakefulness. Thirty-two channels of EEG were recorded in 10 subjects during eyes-closed rest inside a 1.5-T magnet resonance (MR) scanner using an MR-compatible EEG recording system. Functional scanning by echoplanar imaging covered almost the entire cerebrum every 4 s. Off-line MRI artifact subtraction software was applied to obtain continuous EEG data during fMRI acquisition. The average alpha power over 1-s epochs was derived at several electrode positions using a Fast Fourier Transform. The power time course was then convolved with a canonical hemodynamic response function, down-sampled, and used for statistical parametric mapping of associated signal changes in the image time series. At all electrode positions studied, a strong negative correlation of parietal and frontal cortical activity with alpha power was found. Conversely, only sparse and nonsystematic positive correlation was detected. The relevance of these findings is discussed in view of the current theories on the generation and significance of the alpha rhythm and the related functional neuroimaging findings.
UR - http://www.scopus.com/inward/record.url?scp=0042425785&partnerID=8YFLogxK
U2 - 10.1016/S1053-8119(03)00286-6
DO - 10.1016/S1053-8119(03)00286-6
M3 - Article
C2 - 12948703
AN - SCOPUS:0042425785
SN - 1053-8119
VL - 19
SP - 1463
EP - 1476
JO - NeuroImage
JF - NeuroImage
IS - 4
ER -