Mr compatible electrode cap

Continuous EEG data were collected from 32 scalp sites (Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T7, T8, P7, P8, Fz, FCz, Cz, Pz, Oz, FC1, FC2, CP1, CP2, FC5, FC6, CP5, CP6, TP9, TP10, POz) with an additional electrode placed on the back to monitor ECG. We used sintered Ag/AgCl ring electrodes in an MR-compatible electrode cap from Brain Products (Munich, Germany) according to the 10-20 system of electrode placement. Electrode impedances were kept below 10 kΩ. The nonmagnetic, battery powered EEG amplifier was 6 placed in the scanner bore behind the head coil and stabilized with sandbags. The subject's head was immobilized using cushions. All 32 channels were recorded with FCz as reference and AFz as ground. The data were recorded with a bandpass filter of 0.1-250 Hz and digitized at a rate of 5 kHz with 0.5 μV resolution (16 bit dynamic range, 16.38 mV).

EEG data were collected from 32 scalp sites with an additional electrode placed on the lower back to monitor ECG. We used sintered Ag/AgCl ring electrodes in an MRcompatible electrode cap from Brain Products (Munich, Germany) according to the 10-20 system of electrode placement. Electrode impedances were kept below 10 kΩ. FCz was used as reference and AFz as ground. The data were recorded with a bandpass filter of 0.01-250 Hz and digitized at a rate of 5 kHz with 0.5 μV resolution (16 bit dynamic range, 16.38 mV). The nonmagnetic EEG amplifier was placed in the scanner bore behind the head coil, and the participant's head was immobilized using cushions. EEG data were transmitted to a BrainAmp USB adapter and synchronized to the MRI master clock via a SyncBox (Brain Products).