[FieldTrip] error in ft_prepare_headmodel

Tom Marshall tom.marshall at psy.ox.ac.uk
Tue Jan 9 17:27:25 CET 2018

Howdy 'Trippers,

I got a weird error when trying to create a template headmodel using ft_prepare_headmodel (basically just following the steps in the tutorial 'Creating a sourcemodel for source-reconstruction of MEG or EEG data').

After loading and segmenting the template brain I called ft_prepare_headmodel using the suggested parameters.

cfg          = [];
cfg.method   = 'singleshell';
template_headmodel = ft_prepare_headmodel(cfg, template_seg);

This gave the following error.

Error using ft_notification (line 314)
please specificy cfg.tissue and pass an appropriate segmented MRI as input data

Error in ft_error (line 39)

Error in ft_prepare_headmodel (line 354)
          ft_error('please specificy cfg.tissue and pass an appropriate segmented
          MRI as input data')

So I added cfg.tissue...

cfg          = [];
cfg.method   = 'singleshell';
cfg.tissue   = 'brain';
template_headmodel = ft_prepare_headmodel(cfg, template_seg);

...and this upset fieldtrip. After printing 'smoothing brain with a 5-voxel FWHM kernel', it hung for 10-15 minutes, then threw an error with lots of 'Missing symbol' statements (see below - there are a few hundred more, I just copypasted the last two).

Missing symbol '_vm_allocate' required by
Missing symbol '_vm_deallocate' required by

Error in spm_smooth>smooth1 (line 105)

Error in spm_smooth (line 40)

Error in volumesmooth (line 18)
spm_smooth(output, output, fwhm);

Error in ft_datatype_segmentation (line 229)
          brain = volumesmooth(brain,    smooth,    'brain');

Error in prepare_mesh_segmentation (line 95)
    mri = ft_datatype_segmentation(mri, 'segmentationstyle', 'probabilistic',
    'hasbrain', 'yes');

Error in ft_prepare_mesh (line 147)
    bnd = prepare_mesh_segmentation(cfg, mri);

Error in ft_prepare_headmodel (line 337)
        geometry = ft_prepare_mesh(tmpcfg, data);

It seems like the problem is somewhere deep down in spm commands that fieldtrip is calling, so maybe nobody has a clue. I'm hoping somebody has seen this before and knows of a fix...

In case it's relevant: I'm running fieldtrip-20170726 in matlab R2017a on a mac.

And ideas?

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