[Mne_analysis] Question about the orientation of source estimate

[Alexandre Gramfort]

hi,

I have a question about the source orientation. When I use mne.lcmv to do
> the source localization and extract the time course within a label, the
> result time course has both positive and negative values if I choose
> ‘normal’ orientation. What does the sign mean?


it tells you if the current goes into the cortex or out of the cortex.


> And how can I average the time course across subjects when their sign is
> quite different even for the same anatomical labels.
>

people usually take the absolute value to avoid this problem (it it is one
for your data).

HTH
Alex


>
> Could anyone give some suggestions?
>
> Thank you so much!
>
> -Best,
>
> Xiaoxu
>
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