[FieldTrip] problem using ft_sourceparcellate

[Stefan Dvoretskii]

Dear Johannes,

which connectivity measure are you using? There is a potential bottleneck
in the 'ft_connectivityanalysis', which can however be circumvented with
custom code, at least for dwPLI. Then you won't even need to parcelate.
We are currently working to incorporate it into the Fieldtrip code.

Best regards,
Stefan


пн, 4 окт. 2021 г., 11:06 Johannes Gehrig via fieldtrip <
fieldtrip at science.ru.nl>:

> Dear Fieldtrip-user,
>
> I am facing a problem using ft_sourceinterpolate. I am following the "Whole
> brain connectivity and network analysis"- Tutorial and as I can not compute
> the connectivity directly with the source data ("out of memory") I would
> like to perform the source parcellation before computing the connectivity.
> Unfortunately (fieldtrip 20211001 and matlab2018b) ft_sourceparcellate
> crashes after calling it. Before computing the source data the sourcemodel
> was interpolated with the atlas using ft_sourceinterpolate. Therefore the
> amount of positions in the atlas and the source data is the same (8004).
>
> load('atlas_MMP1.0_4k.mat');
> cfg = [];
> cfg.parcellation = 'parcellation';
> cfg.method       = 'mean';
> cfg.parameter    = 'all';
> parc_sourceOn = ft_sourceparcellate(cfg, source_ON, atlas);
>
> Error message:"
> there are in total 8004 positions, 4544 positions are inside the brain,
> 8004 positions have a label
> 4544 of the positions inside the brain have a label
> 4544 of the labeled positions are inside the brain
> 0 of the positions inside the brain do not have a label
> creating 362 parcels for parameter csd by taking the mean
> computing parcellation
> 232           tmp(j,:,:) = cellmean1(dat(tissue==j));
> computing parcellation for L_V1_ROI
> Index exceeds array bounds.
>
> Error in ft_sourceparcellate>cellmean1 (line 494)
> y = x{1};
>
> Error in ft_sourceparcellate (line 232)
>           tmp(j,:,:) = cellmean1(dat(tissue==j));
>
> "
>
> Any help and ideas are very much appreciated!
>
> Best regards, Johannes
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> https://doi.org/10.1371/journal.pcbi.1002202
>
>
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