[FieldTrip] Concerning powcorr_orth method in ft_connectivityanalysis

[SEAN TANABE]

Dear all,

I am trying to use the powcorr_orth method in ft_connectivityanalysis and noticed the results always produce a random connectivity pattern. A similar issue has been raised a year ago here;

https://mailman.science.ru.nl/pipermail/fieldtrip/2017-July/011695.html

I found after editing a line from ft_connectivityanalysis the results look more reasonable, and wanted to confirm if this editing is correct with the fieldtrip developers.
In fieldtrip-20170820 ft_connectivityanalysis I noticed a line which reshapes the fourierspctrm before inputting to ft_connectivity_powcorr_orth (line 852 in fieldtrip-20181113).

        dat = reshape(data.fourierspctrm(:,:,i)', nrpttap, nchan).';
        datout{i} = ft_connectivity_powcorr_ortho(dat, optarg{:});

This seems to not fit the description of ft_connectivity_powcorr_orth, which requires "dat" to have nchan rows.
I changed this to

        dat       = data.fourierspctrm(:,:,i)';
        datout{i} = ft_connectivity_powcorr_ortho(dat, optarg{:});

The above gave natural looking blobs of connectivity in the topology.

Thank you.
Sean


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20181114/7ea6f484/attachment-0001.html>