[FieldTrip] No backprojection following ICA (Peter Lyons)
plyons at udel.edu
Thu Jun 11 15:59:59 CEST 2015
Thanks for your quick response. Just to clarify a few points:
We received the message "not applying the backprojection matrix to the
sensor description" because we do not have a 'tra' matrix defined.
Because we are using EEG data with a one to one relationship between the
number of channels and the number of electrodes, and therefore do not have
a need to define a 'tra' matrix (?), is it safe to assume that our call to
ft_rejectcomponent successfully recomposed our data?
If we do need to define a 'tra' matrix, when is the best time to do so?
I really appreciate your input.
On Wed, Jun 10, 2015 at 8:35 AM, Wanja Moessing <WanjaMoessing at gmx.de>
> Hi Peter,
> I get the same note. From a look into the code of ft_rejectcomponent it
> seems that, for EEG data, this note has to appear as long as you do not
> have a 'tra' matrix in your electrode description.
> The FAQ [
> suggests that this 'tra' matrix should only be there if the channels are
> not exactly equal to your electrodes.
> Please correct me if I am wrong - I am not a FT developer.
> I agree that this message could be a little bit clearer.
> Kind regards,
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
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