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

[Dan G Wakeman]

Hi see follow-ups in text
On 2012 Jun 8, at 20:08 , 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
What does this mean? Could you explain with more detail? Possibly send a screenshot? (though see below, it sounds like there may be some issues in earlier stages, which would be better to send first)
> I cannot get the MRI solutions to change as I change the time sample, thought the other displays behave appropriately
What do you mean by MRI solutions?
> Also, the single MRI solution looks like the dMNE ones, and does not change as I switch to MNE or sLORETA estimates
I'm not sure what you mean by "single MRI solutions" or "dMNE"? What windows are you talking about please describe more details.
> I cannot figure out how to display any EEG on the right-hand Data window, even after choosing "Adjust/select trace layout/sample EEG"
Did you generate an EEG layout? See the manual ( mne_make_eeg_layout )
> 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
Well, if there are these long DC shifts there should be evidence in the evoked data (or raw if this is raw data). Did you use baselines e.g. bmin bmax? How clean are the averages? (maybe send a plot) How clean is your noise covariance data (did you go through the raw data used to calculate it). 

D
> 
> 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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