[Mne_analysis] Re-referencing EEG electrodes in MNE

[Matti Hamalainen]

Hi Alan,

The linked mastoids reference should not be used for source modeling. In my mind it is part of EEG heritage that should be definitely dropped. 
In general re-referencing operations are not linear projection operations. Average reference is a special case.

You need to write some Python or Matlab code to modify your data if you want to view the EEG in the "linked-ears" format. Again this kind of data should not be used for source modeling purposes.

- Matti

On Oct 1, 2013, at 3:38 AM, Alexandre Gramfort <alexandre.gramfort at telecom-paristech.fr> wrote:

> Hi Alan,
> 
> I am not aware of a way to do this in a generic manner with MNE/MNE-Python
> but it should not be hard.
> 
> At what stage of the analysis would you apply the new reference? on
> Raw or Evoked?
> 
> Maybe you can draft a python function to do this and we can see how to
> merge this to mne-python?
> 
> best,
> Alex
> 
> 
> On Tue, Oct 1, 2013 at 12:43 AM, Alan <alan.leggitt at ucsf.edu> wrote:
>> Hello,
>> 
>> I'm using MNE and MNE-Python to analyze EEG data from a 64 channel biosemi
>> EEG cap, with no MEG channels, and 2 mastoid EEG channels for reference. I'd
>> like to re-reference (offline) my EEG channels to the average of the 2
>> mastoids. Is there a way to do this with either MNE command line or MNE
>> python? I see that if I wanted to apply an average reference of all EEG
>> channels, MNE command line stores this as a source space projection. What
>> would this projection file look like if it were just the 2 mastoid
>> electrodes?
>> 
>> Thank you and I apologize if this has been addressed in a previous thread.
>> 
>> Regards,
>> Alan Leggitt
>> 
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---------

Matti Hamalainen, Ph.D.
Athinoula A. Martinos Center for Biomedical Imaging
Massachusetts General Hospital

msh at nmr.mgh.harvard.edu
mhamalainen at partners.org






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