Single channel approach for filtering electroencephalographic signals strongly contaminated with facial electromyography

<strong>Data: EEG contaminated by facial EMG</strong> The dataset contains the EMG and EEG signals collected for the study of contamination by facial EMG on EEG. For each volunteer (S1 to S10), there are five “.mat” files, referring to the five muscles activated to generate contamination of facial EMG on EEG. For each muscle there are some variables: 1. <strong>amplifier_data</strong>: It is a matrix with the EMG (card A) and EEG (card B) signals collected. The amplifier_channels structure and the t_amplifier vector refere to <strong>amplifier_data</strong> matrix. 2. <strong>board_dig_in_data</strong>: As expected in the experimental protocol, the collection is performed with the eyes in two states: only open and only closed. The <strong>board_dig_in_data </strong>variable contains digital values (0 or 1). The first moment containing 1s marks the beginning of the eye-open-only state and the second moment indicates the eye-closed-only state. The board_dig_in_channels structure and the t_dig vector refere to <strong>board_dig_in_data </strong>variable. 3. <strong>supply_voltage_data</strong>: Data collection is performed by two acquisition cards, A(EMG) and B(EEG). The supply voltage of each card is monitored, and the measured values are stored in this variable. The supply_voltage_channels structure and the t_supply_voltage vector refere to <strong>supply_voltage_data </strong>variable. <strong>EMG and EEG data</strong> The data of interest for the collection are in the <strong>amplifier_data </strong>variable, a matrix with n rows and m columns, where n is the number of channels (EMG and EEG) and m is the number of data acquired at the sampling frequency for the entire collection time interval. EMG channels are collected by “Port A”, and EEG channels are collected by “Port B”, but all EMG and EEG data are in the same <strong>amplifier_data </strong>variable. The name “Port A” or “Port B” comes from the choice of cable used to connect the acquisition cards to the RHD2000 USB interface system. Thus, based on the choice adopted in connecting the EMG and EEG cards in this research, the <strong>amplifier_data </strong>variable has the first lines belonging to “Port A” (EMG) and the other lines of the matrix being from “Port B” (EEG). The amplifier_channels structure indicates which card was used with the name “Port A” and “Port B” in the port_name field. <strong>EMG data</strong> The muscle signal data does not have a specific and fixed channel between collections. Thus, the channel number for a muscle must be verified at each data collection. The information for each channel must be consulted in the amplifier_channels structure at the custom_channel_name field. <strong>EEG data</strong> A bipolar 16-channel acquisition card acquires EEG signals. The channels of each EEG sensor are the same for all collections, thanks to the use of the adapted EEG cap, and the connection of the EEG signals card is always carried out on the same cable B. The EEG cap has bipolar transverse mounting configuration. EEG sensors channel list, channel x EEG sensor: Ch00: F3-Fz; Ch01: F4-F8; Ch02: F7-F3; Ch03: Fp1-Fp2; Ch04: T3-C3; Ch05: C4-T4; Ch06: T5-P3; Ch07: P4-T6; Ch08: Fp2-F8; Ch09: F7-Fp1; Ch10: Fz-F4; Ch11: Cz-C4; Ch12: O1-O2; Ch13: P3-Pz; Ch14: Pz-P4; Ch15: C3-CZ.**数据：受面部肌电（EMG, Electromyography）污染的脑电图（EEG, Electroencephalogram）信号** 本数据集包含为研究面部肌电对脑电图的污染效应而采集的肌电与脑电信号。针对10名受试者（编号S1至S10），每名受试者对应5个".mat"格式文件，分别对应5种用于制造脑电污染的面部激活肌肉。 针对每块肌肉，数据集包含以下变量： 1. **放大器数据（amplifier_data）**：该变量为采集得到的肌电（通道A）与脑电（通道B）信号组成的矩阵。放大器通道结构（amplifier_channels）与t_amplifier时间向量对应该放大器数据矩阵。 2. **板载数字输入数据（board_dig_in_data）**：根据实验方案，信号采集过程中受试者眼部处于两种状态：仅睁眼与仅闭眼。该变量存储数字量（0或1），首个出现1的时刻标记仅睁眼状态的起始，第二个出现1的时刻则标记仅闭眼状态的起始。板载数字输入通道结构（board_dig_in_channels）与t_dig时间向量对应该板载数字输入数据变量。 3. **电源电压数据（supply_voltage_data）**：本数据集通过两块采集卡完成信号采集：卡A用于采集肌电信号，卡B用于采集脑电信号。两块采集卡的电源电压均被实时监测，测量值存储于该变量中。电源电压通道结构（supply_voltage_channels）与t_supply_voltage时间向量对应该电源电压数据变量。 **肌电与脑电数据** 本研究关注的核心数据存储于**放大器数据（amplifier_data）**变量中：该矩阵共n行m列，其中n为通道总数（含肌电与脑电通道），m为整个采集时段内以采样率计算得到的总数据点数。肌电通道通过"Port A"采集，脑电通道通过"Port B"采集，但两类信号均存储于同一放大器数据变量中。 "Port A"与"Port B"的命名源自采集卡与RHD2000 USB接口系统连接时所用的线缆选型。因此，基于本研究中肌电与脑电采集卡的连接方案，放大器数据变量的前若干行对应"Port A"（肌电信号），矩阵剩余行则对应"Port B"（脑电信号）。放大器通道结构的port_name字段可标识对应通道属于"Port A"还是"Port B"。 **肌电数据** 肌电信号的通道编号在不同采集批次间无固定对应关系，因此每次采集时需单独确认每块肌肉对应的通道编号。各通道的详细信息需查阅放大器通道结构中的custom_channel_name字段。 **脑电数据** 本研究采用16通道双极型采集卡采集脑电信号。由于使用了适配的脑电帽，所有采集批次中脑电传感器的通道配置保持一致，且脑电采集卡始终通过线缆B连接。该脑电帽采用双极横向安装配置。 脑电传感器通道对应关系如下（通道编号x对应脑电传感器组合）： Ch00: F3-Fz；Ch01: F4-F8；Ch02: F7-F3；Ch03: Fp1-Fp2；Ch04: T3-C3；Ch05: C4-T4；Ch06: T5-P3；Ch07: P4-T6；Ch08: Fp2-F8；Ch09: F7-Fp1；Ch10: Fz-F4；Ch11: Cz-C4；Ch12: O1-O2；Ch13: P3-Pz；Ch14: Pz-P4；Ch15: C3-Cz