mne.combine_evoked weights

[aalt]

Hello, I have some questions regarding the mne.combine_evoked() function.
I would like to combine evokeds in order to compare them as follows:
let’s say I have 4 conditions a1, a2, b1, b2, and I want to combine a1 and a2 as a same condition, as well as for b1 and b2 as a single condition, to be able to compare condition a to condition b.
How should I weight those ?
mne.combine_evoked([evokeds[a1],evokeds[a2], evokeds[b1],evokeds[b2], weights=[1,1,-1,-1])

Is this correct?

Thank you

[richard (Richard Höchenberger)]

Hello,

@aalt

mne.combine_evoked([evokeds[a1],evokeds[a2], evokeds[b1],evokeds[b2], weights=[1,1,-1,-1])

I’d think that this is the correct approach, yes.

Best wishes,
Richard