[Eeglablist] Sampling rate

[mori larin]

Dear list,

I am using EEG data and I have two questions:
1) I am not sure about sampling rate. The EEG data was recorded at 5000 Hz
and I have to down sample it for further work. I used 256 Hz and I do not
know is it correct or not. How should we select the re-sampling rate? Could
it be any number and which criteria needs to be considered?

2) For the EEG data which is recorded simultaneously with fMRI data, in
order to remove gradient and BCG artefacts automatically from the data
using ICA , should I have to remove gradient artefacts before running ICA
and then trying to find the remaining effect of gradient artefact in ICA
components? (and what are the methods to remove it) or I have to run ICA on
the contaminated data directly? The latter I think I have to expect more
components associated to gradient artefacts because the amplitude of the
gradient artefacts are larger than brain signals.

I really appreciate it if you could help me,

Regards,
Morin
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