EEG and IMU data

60 EEG channels and 4 EOG channels were recorded at a sampling rate of 100 Hzfrom the Brain Products actiCap System.46<br> The electrodes were placed and labeled using a modified version of the 10-20 system5. Four posterior electrodes – TP9, TP10,47<br> PO9, PO10 – were reallocated as vertical and horizontal EOG sensors for the recognition and removal of eye movement/blink48<br> artifacts from the 60 EEG channels using an H∞ filter6. Electrodes FT9 and FT10 were also moved to the standard AFz and49<br> FCz locations respectively, and the ground and reference electrodes were then placed on the left and right ears. To help maintain50<br> low impedances, electrolytic gel was injected between each electrode and the subjects’ scalps. Impedances were tested and51<br> recorded before and after each session. The 3D spatial locations of all 64 electrodes were digitally scanned and recorded for52<br> most sessions (see Table 1) using the Brain Products CapTrak system; these specific coordinate locations could be used for53<br> subject- and session-specific EEG source localization and to ensure consistent electrode placement across sessions. Finally,54<br> an elastic mesh was fitted over the scalp and EEG cap to help keep the electrodes in place and reduce motion artifacts due to55<br> cable movement during the recording process. In addition to EEG data, each subject was fitted with inertial measurement units56<br> (Opals, APDM Inc.) in the center of each subject’s foreheads and on the back brace of the exoskeleton. T