[FieldTrip] layout file error after upgrading to the newest version

[Tzvetan Popov]

Dear Marta,

In your cfg.elec, a 3D description of electrodes positions is expected. Yet you have a 2D layout structure. I assume that your neighbours are also defined in this 2D plane. 
Can you comment out the cfg.elec line and try again? Ft_read_sens is not supposed to work on 2D layout file, hence the error. 

Good luck,
tzvetan


> On 27 May 2021, at 22:24, Marta Topor <m.topor at surrey.ac.uk> wrote:
> 
> Dear colleagues, 
> 
> I came across a surprising error and I am struggling to figure it out. 
> I wrote a few scripts last year in version fieldtrip-20200409. They all worked fine, last time I worked with those scripts in that version was January 2021. I had to take care of a few other tasks since then, so the project was on pause. I had my work laptop upgraded in the meantime which meant I had to upgrade to the newest Fieldtrip version.
> 
> I started working on that same project again, in version fieldtrip-20210525, and noticed layout file issues when interpolating channels. 
> 
> For a bit of background,  I am using the Mobita water-based 32 EEG electrode system. I created my own layout file in the previous Fieldtrip version which worked without any issues in all scripts.
> I now have an error using the ft_channelrepair() funtion and I think it relates to the ft_read_sens() funtion. 
> 
> The cfg I used: 
> cfg = [];
> cfg.method          = 'spline';
> cfg.neighbours      = neighbours_EEG;
> cfg.badchannel      = badchannels_train;
> cfg.senstype        = 'EEG';
> cfg.elec            = layout_file;
> mydata_interpolated_train = ft_channelrepair(cfg, mydata_artrm_train);
> 
> 
> The layout file fields are:
> pos: [34×2 double]
> label: {34×1 cell}
> width: [34×1 double]
> height: [34×1 double]
> outline: {1×4 cell}
> mask: {[101×2 double]}
> cfg: [1×1 struct]
> 
> But I can only see these fields if I use the function importdata(). When I use the function ft_read_sens() and when I try to interpolate channels, I get the following error:
> 
> Error message:
> Unrecognized function or variable 'lab'.
> 
> Error in channelposition (line 352)
> n = size(lab,2);
> 
> Error in ft_datatype_sens (line 438)
>         [chanpos, chanori, lab] = channelposition(sens);
> 
> Error in ft_datatype_sens (line 240)
>     sens      = ft_datatype_sens(sens, new_argin{:});
> 
> Error in ft_datatype_sens (line 207)
>     sens      = ft_datatype_sens(sens, new_argin{:});
> 
> Error in ft_datatype_sens (line 180)
>     sens      = ft_datatype_sens(sens, new_argin{:});
> 
> Error in ft_read_sens (line 539)
> sens = ft_datatype_sens(sens);
>  
>  
> There are no errors when I plot the channels using the following code though and it all looks absolutely fine:
> cfg = [];
> cfg.layout = layout_m; %layout_m is imported from the layout_file using the importdata() function
> cfg.channel = 'eeg';
> ft_layoutplot(cfg, mydata_artrm_train);
> 
> 
> Any ideas what could be the issue here and how I could get it solved? 
> Thanks for your help in advance!
> 
> _________________________
> Marta Topor
> PhD Candidate
> 
> Room 07AC04
> School of Psychology
> University of Surrey 
> 
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> https://doi.org/10.1371/journal.pcbi.1002202 <https://doi.org/10.1371/journal.pcbi.1002202>
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