# short question about EEG reference

**URL:** <https://mne.discourse.group/t/short-question-about-eeg-reference/123>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [May 13, 2009, 3:39pm UTC](https://mne.discourse.group/t/short-question-about-eeg-reference/123 "2009-05-13T15:39:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 13, 2009, 3:39pm UTC](https://mne.discourse.group/t/short-question-about-eeg-reference/123/1 "2009-05-13T15:39:38Z")

</div>

Hi everybody,

I would to know how to activate the average EEG reference (and only this  
option) in the computation of raw data: do I write "- -proj on " ? Does  
it risk to affect the MEG channels ?

There is no projection file in my data directory. I don't want to use  
ssp.

Thank you very much for your help !

Bye

Ghislain

gbdf at [hotmail.fr](http://hotmail.fr)

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