[Mne_analysis] Source current directions

[Alexandre Gramfort]

hi,

> Thanks for the quick reply.  So is there any method to transform the forward
> matrix G in some way, so that all currents have the same sign?

not really. See however the sign flip trick that MNE uses to avoid cancelation
when summing currents in a region of interest.

http://martinos.org/mne/stable/auto_examples/inverse/plot_compute_mne_inverse_epochs_in_label.html
http://martinos.org/mne/stable/generated/mne.label_sign_flip.html#mne.label_sign_flip
http://martinos.org/mne/stable/generated/mne.extract_label_time_course.html

HTH
Alex