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 The electrodes were placed and labeled using a modified version of the 10-20 system5. Four posterior electrodes – TP9, TP10,47 PO9, PO10 – were reallocated as vertical and horizontal EOG sensors for the recognition and removal of eye movement/blink48 artifacts from the 60 EEG channels using an H∞ filter6. Electrodes FT9 and FT10 were also moved to the standard AFz and49 FCz locations respectively, and the ground and reference electrodes were then placed on the left and right ears. To help maintain50 low impedances, electrolytic gel was injected between each electrode and the subjects’ scalps. Impedances were tested and51 recorded before and after each session. The 3D spatial locations of all 64 electrodes were digitally scanned and recorded for52 most sessions (see Table 1) using the Brain Products CapTrak system; these specific coordinate locations could be used for53 subject- and session-specific EEG source localization and to ensure consistent electrode placement across sessions. Finally,54 an elastic mesh was fitted over the scalp and EEG cap to help keep the electrodes in place and reduce motion artifacts due to55 cable movement during the recording process. In addition to EEG data, each subject was fitted with inertial measurement units56 (Opals, APDM Inc.) in the center of each subject’s foreheads and on the back brace of the exoskeleton. T本次实验采用Brain Products actiCap系统采集60路脑电（Electroencephalogram, EEG）与4路眼电（Electrooculogram, EOG）信号，采样率为100 Hz[46]。电极的布设与命名采用改良版10-20系统[5]，其中四枚后侧电极TP9、TP10、PO9及PO10被重新分配为垂直与水平眼电传感器，用于通过H∞滤波器[6]识别并去除60路脑电信号中的眼动/眨眼伪迹[48]。电极FT9与FT10亦分别被调整至标准AFz和FCz位置，接地电极与参考电极随后安置于左右耳部。为维持较低的电极阻抗，在每枚电极与受试者头皮间注入导电胶[50]。每次实验前后均需测试并记录电极阻抗[51]。多数实验会话采用Brain Products CapTrak系统对全部64枚电极的三维空间位置进行数字化扫描与记录[52]（详见表1），该精确坐标可用于针对特定受试者与实验会话的脑电源定位，同时确保不同会话间电极位置的一致性[53]。最后，在头皮与脑电帽外佩戴弹性网罩，以固定电极位置并减少录制过程中线缆移动引发的运动伪迹[54-55]。除脑电数据外，每名受试者的额头中央以及外骨骼背部支撑处均安装了惯性测量单元（Opals, APDM Inc.）[56]。