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. 2005 Jan 27;24(4):291–298. doi: 10.1002/hbm.20087

Figure 1.

Figure 1

A: Raw EEG trace recorded in static magnetic field, without MRI scanning, for a representative subject (electrode O1). Peaks synchronous and delayed of a constant lag respect to cardiac activity (channel EKG) are clearly visible, indicating that they are due to cardiac pulse effect. B: Raw EKG trace recorded in static magnetic field: peaks are detected and marked. C: Reliable EEG obtained after correction procedure for electrode O1.