[FieldTrip] Different results with source reconstruction from July 2018 and onwards

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

Dear Frans,

Why do you say that there’s a ‘huge’ change? I hardly see the difference, that is the most prominent features in the time series are pretty comparable I’d say.

Just to be clear on this: are you comparing the results across operating systems? At this point I don’t see any changes in the code from 11 to 12 July 2018 that at first sight would affect your analysis. The ‘guilty’ commit is a merge of a PR by Sarang that pertains to (bookkeeping of data needed for) forward computations using openmeeg as a method. I don’t see how that would affect your analysis pipeline, if it is sufficiently close to the one on OSF that you refer to.

Best wishes,
Jan-Mathijs






On 6 Dec 2021, at 16:59, Frans Nord via fieldtrip <fieldtrip at science.ru.nl<mailto:fieldtrip at science.ru.nl>> wrote:

Hello all,

I get different results with the same source reconstruction code when using Fieldtrip before 11 July 2018 compared to 12 July 2018. The results I get from before the twelfth seems to be more in line with previous found intracranial results and measurements on sensor level. I'm using eLORETA and the code is basically the same as this: https://osf.io/bgfs5/?view_only=ebb85532e1064d128db79bacb6be27f8<https://urldefense.com/v3/__https://osf.io/bgfs5/?view_only=ebb85532e1064d128db79bacb6be27f8__;!!HJOPV4FYYWzcc1jazlU!_AyLxWa-VXiG3g1vjZDuQdq7Ze9eST4_qjhy9H4t0vaBg2DIzlz-a283UfUGtsZL3SLJzRwNkeK-Jwyb22bpLfLvJvxdqgnfvxtpvQ$>

The 'pre' attached file is how the first trial for the first participant look with the version before july 11 and the 'post' is after july 11.

 - Operating System:  Windows 10 and Mac os:x Mojave
 - MATLAB version: R2019a
 - FieldTrip version: fieldtrip-171478a3e1c71f499ad0cf01f661dbb257ff5eb5 and fieldtrip-d1aa34272c61454dbbd9684f836c68b2dd26f337


What was it that justified such a huge change in the model? Can I read about it somewhere? Note that this is not the problem described in https://github.com/fieldtrip/fieldtrip/issues/1020<https://urldefense.com/v3/__https://github.com/fieldtrip/fieldtrip/issues/1020__;!!HJOPV4FYYWzcc1jazlU!_AyLxWa-VXiG3g1vjZDuQdq7Ze9eST4_qjhy9H4t0vaBg2DIzlz-a283UfUGtsZL3SLJzRwNkeK-Jwyb22bpLfLvJvxdqgk-MKNj-g$> but appeared in an earlier version.

Best regards
Frans
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