[Mne_analysis] misc concerns and questions with mne_analyze and 256-channel EEG data

[Matti Hamalainen]

One problem here was that a flat channel was included in the inverse calculation. Since its noise is zero, the inverse calculation goes haywire.

- Matti


On Jun 9, 2012, at 3:00 AM, Jeff Eriksen wrote:

> Hi MNE analyzers,
> 
> I have just succeeded in manipulating my data so that I can use mne_analyze for interactive analysis. So far I have
> 
> Exported EEG as EDF file
> Converted to FIF file
> Aligned electrodes to scalp surface
> Created a single event and averaged so I could treat my raw data as averaged data (only way to get to into mne_analyze, I am told)
> Created BEM, forward, and inverse
> Loaded all into mne_analyze
> 
> Questions & concerns:
> 
> Source solutions on inflated surface do not seem to bear any relation to the scalp EEG data plotted on the scalp surface
> I cannot get the MRI solutions to change as I change the time sample, thought the other displays behave appropriately
> Also, the single MRI solution looks like the dMNE ones, and does not change as I switch to MNE or sLORETA estimates
> I cannot figure out how to display any EEG on the right-hand Data window, even after choosing "Adjust/select trace layout/sample EEG"
> I can find not mention in the manual on how to adjust the display amplitude of the source waveforms in the bottom left pane
> MNE source locations are fairly evenly spread out across both hemispheres, but dSMP and sLORETA's are mainly confined to R hemi
> All the source waveforms appear to have DC shifts lasting for the entire epoch – this does not seem right
> 
> All in all, I am not comfortable with what I am observing, and wonder if I have dome something grossly wrong in my analysis stream so far. I am post files and screenshots to DropBox if anyone is willing to assist me with any of the above.
> 
> The best thing I can think of doing at this point is to create some simulated time courses and EEG and run it through the steps I have performed above.
> 
> -Jeff Eriksen
> 
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