[Mne_analysis] Beginner Question: epoching with subset of channels after average re-reference

[Stephen Politzer-Ahles]

Hi Ghislain,

Do you actually need to epoch just a subset of channels? What I usually do
is apply my pre-processing (including epoching) to the whole montage, and I
don't worry about pulling out specific channels until I get to data
analysis (e.g. when I want to plot just the channel that I care about, or
run statistics just on a couple channels, or whatever).

An additional benefit of keeping all the data for as long as I can is that
if I later decide to do some post-hoc, exploratory analysis on some other
channels, I already have that data, instead of having to re-run my
preprocessing on those other channels.

Best,
Steve



---
Stephen Politzer-Ahles
University of Oxford
Language and Brain Lab
Faculty of Linguistics, Phonetics & Philology
http://users.ox.ac.uk/~cpgl0080/
<http://www.nyu.edu/projects/politzer-ahles/>

On Fri, Jul 8, 2016 at 8:38 PM, Ghislain d'Entremont <
ghislaindentremont at gmail.com> wrote:

> Hi all,
>
> I just started using MNE to analyze some EEG data I collected for a study
> I am conducting. So far, I've been enjoying learning about the package. The
> tutorials online are great. However, I seem to be stuck on something I can
> only imagine is straightforward. First, an overview of what I am trying to
> accomplish:
>
> I use a 64-electrode cap.
>
> Ultimately, I want to (1) re-reference to the average of all electrodes,
> (2) apply some basic filters (3) look ERPs of 4 channels for various target
> types.
>
> I get stuck getting epochs (3). When trying to select one channel to
> epoch, I get the warning message telling me that I should not apply a
> projector to 1/64 of channels...
>
> How do I get around this given that I want to both re-reference to the
> average of *all *electrodes and only do analysis on some subset of
> channels.
>
> I imagine that it is clear that I am confused, so any conceptual tips with
> respect to the implementation of this package will be helpful.
>
> I've attached the script I have been using. The last line of that script
> is where I get stuck (as the comments will show).
>
> Any help will be greatly appreciated.
>
> Thank you,
>
> *Ghislain d'Entremont*
> BSc, Neuroscience, Honors
> Dalhousie University
> tel: 902-802-5671 (text)
>
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