[Eeglablist] EEGLab to FieldTrip Conversion

[Tarik S Bel-Bahar]

 Hello Tyler Durdern, Brief notes here that might be of use. .......  Check
out if you haven't had  a chance to: scripts from  the recent Frontiers
Special Issue on EEG open source softwares, asking chatgpt for (just)
hints. Some recent published pipelines with connectivity outputs,
Pellegrini..Delorme et al (2022) and  Discover (Avila et al., 2023) may be
useful to you. As noted, something as follows does work via script, e.g.,
1) Use the conversion function to generate a Fieldtrip structure from EEG
structure, 2) add fieldtrip path; run default ft start that sets its paths
they way it wants, 3) Feed the FT structure to FT connectivity compute
function, 4) grab the output matrix and details and save. Overall,
connectivity metrics computed in one place with a specific function may not
be same as those in other softwares, platforms, or source publication
formulas. Thus, currently, caveat connectivity emptor...Moving forward,
likely that published e/meg connectivity metrics will always include
published code, and (someday)  live as part of a "common test bank" for
scientists and developers to check against. Much depends on the level of
development and interoperability in  open-source softwares, current uptake
of standardized techniques or function-test banks, and mandates by
funders/publishers.



On Wed, Mar 1, 2023 at 10:59 AM Tyler Durdern <ty_du at gmx.de> wrote:

> Dear all,
>
> I have estimated connectivity between EEG channels using the phase-lag
> index (A function included in the FCLab toolbox for EEGlab). To validate
> the results I want to compare Phase-lag indices with another prominent
> connectivity estimate, the weighted phase-lag index. I found that the most
> common way to compute this metric is to use the field trip toolbox and it’s
> corresponding function ft_connectivity_wpli.
> Unfortunately I have only ever worked with EEGlab and I want to omit
> having to completely start over my analysis in FieldTrip as all
> data has already been preprocessed using EEGlab. Therefore, I was looking
> for a way to convert my preprocessed
> data (in EEGlab format) to Fiedltrip. I found the function
> eeglab2fieldtrip, although the data format I obtain does not seem
> to work since I get numerous errors when trying to use fieldtrip functions
> on the data structure.
>
> Therefore, my question is two-fold: 1) Is there a way to convert
> preprocessed EEG data to fieldtrip data, and 2) Is it possible
> to compute the weighted phase-lag index in EEGlab in the first place?
>
> Thanks in advance for your help!
>
> Best,
>
> Tyler
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