/966 EEG Amplifier VXMn人个VmIv Pre-stimulus period Stimulus onset x 100 trials Signal averaging computer ERP Stimulus onset Sound generator 700 msec 12
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Raw Stim 1 EEG Stim 2 Stim N A v EEG ERP分段叠加显示图 Segments Averaged ERP Stim 1 Waveform N2 B Stim 2 (An)ebelio P3 Stim N 200 00 600 Time (ms)
13 ERP分段叠加显示图 Stim 1 Stim 2 Stim N Stim 1 Stim 2 Stim N
B EEG Recorded from the Pz Electrode Site X 0 0 X /966 1000 20003000400050006000700080009000 Time in milliseoonds EEG Segments Following Marker Codes Average of 80 Xs Average of 20 Os 0 200400 600 800 Time in milliseoonds 14
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ERP的基本预处理 了6 滤波(e.g,30 Hz low pass)) ■去处伪迹(Artifact rejection) ■分段，叠加平均，增加SN比 ■平均参照（Average reference) ■基线矫正(100~200 ms before stimulus) 15
15 滤波 (e.g., 30Hz low pass) 去处伪迹 (Artifact rejection) 分段，叠加平均，增加S/N比 平均参照（Average reference） 基线矫正（100~200 ms before stimulus） ERP的基本预处理
/966 50Hz干扰图 4 ywwwwwL-nm 形 FI& FI& C3- C3- 00 Z w..h./ 16
16 50Hz干扰图