[FieldTrip] new release with critical fix for DICS

[Schoffelen, J.M. (Jan Mathijs)]

Dear all,


Regretfully we identified a bug in FieldTrip releases starting from release 20200701<https://github.com/fieldtrip/fieldtrip/releases/tag/20200701> onward, which might have affected your results.

Specifically, if you have been using ft_sourceanalysis with DICS as a method, and if the order of the channels of the input data structure was not alphabetical, the results are incorrect. This is caused by an accidental alphabetical reordering of the channels in the cross-spectral density matrix, which was not reflected by a similar reordering in the leadfields. We are grateful to Alexandra Steina to help us identify and resolve it. See issue #1587<https://github.com/fieldtrip/fieldtrip/issues/1587> on GitHub for more information.

Are you affected? If you used a FieldTrip version between 20200701 and 20201126, and you used ft_sourceanalysis with method DICS, and your channels are not in alphabetical order, then you are likely affected. For CTF MEG data the channels are usually in alphabetical order. Neuromag/Elekta MEG data, and MEG data from other systems often have the channels not in alphabetical order. The same holds for EEG data, so your results are likely affected if you are working with EEG data, or non-CTF MEG data.

To resolve the problem, please update to the latest 20201126 release version from the FTP server or from the GitHub release page<https://github.com/fieldtrip/fieldtrip/releases>, recompute your source estimates, and your downstream results.

Sorry for the inconvenience, and keep up the good work.

Best regards,

Jan-Mathijs and Robert


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