[Mne_analysis] Large mean voltages in BEM EEG forward model.

[Matti Hamalainen]

On Sep 30, 2008, at 3:54 PM, Justin Ales wrote:

> Hi,
>
> I've been looking at the forward computations generated by MNE.  I've
> been generating my fif files from data I have in matlab. I have an
> average reference montage, and when I look at the forward model there
> are large variations in the average across channels.  Since it is an
> average reference montage I expected the forward model to have zero
> mean. I'm not sure if I don't understand the forward model output from
> MNE, or if I'm not importing my data correctly.

The forward solution itself is never computed using the average- 
reference montage. Rather the average EEG reference is taken into  
account when the inverse operator is computed. To get the average- 
reference montage in matlab, you need to do it yourself.

- Matti