[FieldTrip] EEG preprocessing

[Narayan Iyer]

Hi
I have a question on EEG preprocessing. The sampling rate of my 64 channel EEG data is 500 Hz and I would like to down-sample this to 256 Hz or 128 Hz.My question is, i it advisable to low-pass filter the data first (70 Hz) and then down-sample  followed by high-pass filter (0.5 Hz) to avoid aliasing effect  or should I down-sample first and then band-pass filter the data (0.5-70 Hz) ? Or does the sequence really matter ?I am new to EEG data analysis so this question might be really basic, but any help is highly appreciated!
ThanksSubbu 		 	   		  
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