[FieldTrip] only read this is you are doing source reconstruction on eeg data

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

Dear all,

We have identified and fixed a nasty bug in FieldTrip that has consequences for those who do source reconstruction on EEG data, and have done so using a FieldTrip version of the past month or so. The bug was nasty because it didn’t cause a MATLAB or FieldTrip error.

Please do read on only if you fulfill following two requirements:
-you do source reconstruction of EEG data, using FieldTrip, or a toolbox that relies on low level fieldtrip functionality 
-you have been using a FieldTrip version that’s more recent than December 15, 2014 (svn revision 10043)

Otherwise, have a nice day :-).

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OK, here’s the problem: in order for the EEG source reconstruction to work, the electrodes need to be projected onto the skin surface. In the FieldTrip versions 10043-10093 this projection was incorrect, causing some of the electrodes ending up on wrong locations, causing incorrect forward models (leadfields) and consequently incorrect inverse reconstruction. As of FT-version r.10094 this should be fixed.

Best wishes and apologies for any inconenience caused,

Jan-Mathijs