Dear all,<br><br>I'm interesting in the very slow oscillation of EEG, from 0.01 to 0.2Hz.<br>For that reason I used IIR Butterworth filter from ERPLAB twice, first high-pass (0.01, 24dB/oct) and second low-pass (0.2, 24dB/oct). Not at the same time.<br>
the time length is more than 10 minutes in 1000Hz sampling.<br>In visual inspection, filttered data shows sybchronized phase with raw data. but I'm not sure about this method.<br>Could you give me any comment?<br><br>
Best<br>HanGue.<br>