Interpolating bad channels in EEG

[Robert Oostenveld]

Hi Helen

> Is there a function in Fieldtrip that can replace data from a bad EEG
> channel using interpolation of neighbouring channels?

There is the function MEGREPAIR, which also will work on EEG
channels. It does require that you specify a structure with electrode
positions in 3D. See http://www2.ru.nl/fcdonders/fieldtrip/doku.php?
id=fieldtrip:documentation:frequently_asked_questions#how_are_electrodes
_magnetometers_or_gradiometers_described and see READ_FCDC_ELEC.

Since the function was written for MEG data, you have to add the
electrode structure to the data as if it is a gradiometer structure,
i.e.
   elec = something...
   data.grad = elec
prior to calling MEGREPAIR. You also have to specify
cfg.neighbourdist in the same units as they are in your electrode
definition (e.g. cm or mm).

best regards,
Robert

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