[Mne_analysis] equivalence of averaged single trial STCs and evoked STCs

[dgw]

Hi Denis,

Which line represents "averaging in source space" and which represents
"projecting evokeds"?

Regardless. I think you are referring to why are the results different when
I average single trial data on the source space as opposed to averaging
that same data in sensor space and then source localizing?

The first reason I can think of is that you are using the dSPM here and I
believe that that can lead to some non-linearity between these results. Do
you get the same problem with the L2?

HTH,
D


On Mon, Mar 10, 2014 at 1:56 PM, Denis-Alexander Engemann <
denis.engemann at gmail.com> wrote:

> Hi folks,
>
> in one of my recent analyses I ran into some problems with regard to
> morphing and single trial
> label time series extraction which lead me to set up some comparisons:
>
> https://gist.github.com/dengemann/9470121
>
> (gist based on sample data, should run with a proper MNE-Python install)
>
> [image: Inline image 1]
>
> It turned out morphing was unproblematic, but,
> I'm wondering whether the differences between averaging in source space and
> projecting evokeds is expected, and if so, how it can be avoided?
>
> The background is that I'd like to be confident about the relating single
> trial analyses at the evoked level.
>
> Any thoughts?
>
> Cheers,
> Denis
>
>
>
>
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