[Eeglablist] ERPLAB filter

[HanGue Jo]

Dear all,

I'm interesting in the very slow oscillation of EEG, from 0.01 to 0.2Hz.
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.
the time length is more than 10 minutes in 1000Hz sampling.
In visual inspection, filttered data shows sybchronized phase with raw
data. but I'm not sure about this method.
Could you give me any comment?

Best
HanGue.
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