[FieldTrip] Importing .ses files

Debora Desideri deb.desideri at gmail.com
Thu Jul 23 22:55:06 CEST 2015

Dear Ingrid,
the most straightforward way to read NeurOne data in Fieldtrip is to export
them in .eeg format from NeurOne itself. If I remember well you can do that
going to results, choosing the dataset you want to export and then  the
option "Export Brain Products" (or something like this, I cannot check it
right now, but you should find it easily).  The .eeg format is supported by
Fieldtrip and everything should work smoothly
Hope this help :)
Good luck with your research

On Thu, Jul 23, 2015 at 10:37 PM, Ingrid Sör <ingrid.sor at neuro.uu.se> wrote:

>  Dear community,
> My name is Ingrid Sör and am working at Uppsala University, Sweden, where
> we have recently started up a lab for studying speech and language related
> issues. At the moment I am trying my hand at analysing some trial EEG data
> with Fieldtrip (an oddball paradigm).
> We are using the NeurOne software from MEGA Electronics, which renders
> data in .ses file format. I seem to be having trouble reading this format
> with ft_read_header, so I suspect it isn't supported (but I have read
> different accounts about this here
> <http://www.fieldtriptoolbox.org/dataformat> and here
> <http://www.fieldtriptoolbox.org/getting_started/egi>)? Maybe the file
> formats are also different depending on if they are from NeurOne or Net
> Station?
> As far as I know, exporting to another format can't be done from NeurOne,
> as is suggested for Net Station. MEGA do supply Matlab functions to import
> the data though. But I thought I'd double check that the format actually
> isn't supported before I go down that route. I would also be glad to know
> if anyone has experience with using .ses data from NeurOne and know what
> alternative might be the best for importing to FieldTrip: reformatting the
> data structure rendered by the Matlab functions (from MEGA) to give
> compatibility with FieldTrip, or extending the FieldTrip reading functions
> to make them implement the .ses file format too?
> Further below is some info about my code and the error, if the error could
> be explained by this.
> Any help would be much appreciated.
> Best,
> Ingrid
> -------------
> This is the line I got stuck on, with the error message below.
> cfg = ft_definetrial(cfg);
> Warning: could not determine filetype of
> /media/ingrid/Elements/EEG-data/P300_2015-06/Subject01/NeurOne-2015-06-12T130624.ses
> > In ft_filetype at 1221
>   In utilities/private/dataset2files at 42
>   In ft_checkconfig at 541
>   In ft_definetrial at 128
> Warning: no trialfun was specified, using ft_trialfun_general
> > In ft_definetrial at 135
> evaluating trialfunction 'ft_trialfun_general'
> Error using ft_read_header (line 2053)
> unsupported header format (unknown)
> Error in ft_trialfun_general (line 78)
> hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat);
> Error in ft_definetrial (line 174)
>     [trl, event] = feval(cfg.trialfun, cfg);
>  My cfg structure looks like this:
> cfg =
>        dataset:
> '/media/ingrid/Elements/EEG-data/P300_2015-06/Subject01/NeurOne-2015-06-12T130624.ses'
>       trialdef: [1x1 struct]
>       lpfilter: 'no'
>     continuous: 'yes'
>        channel: 'EEG'
>         layout: 'EEG1020.lay'
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