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

本研究采用Brain Products公司的actiCap脑电采集系统，以100 Hz的采样率采集了60路脑电图（Electroencephalogram, EEG）通道与4路眼电图（Electrooculogram, EOG）通道的数据[46]。电极的放置与命名采用经改良的10-20电极放置系统[5]。选取4个后部电极TP9、TP10、PO9及PO10，将其重新配置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EEG通道中的眼动/眨眼伪迹[48]。电极FT9与FT10亦分别调整至标准AFz与FCz位置[49]，随后将接地电极与参考电极置于受试者左右耳部。为维持较低的电极阻抗，于每枚电极与受试者头皮之间注入导电膏[50]。每次实验前后均对电极阻抗进行测试并记录[51]。多数实验中，采用Brain Products公司的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）；这些精确的坐标位置可用于针对特定受试者与实验的EEG源定位，同时确保不同实验间电极放置位置保持一致[53]。随后于头皮与脑电帽外侧覆盖弹性网罩，用于固定电极位置，并减少录制过程中线缆移动带来的运动伪迹[54,55]。除EEG数据外，每名受试者还在额头中央及外骨骼的背部支撑带上安装了惯性测量单元（Inertial Measurement Unit, IMU），型号为Opals，产自APDM公司[56]。