[FieldTrip] Importing .ses files
ingrid.sor at neuro.uu.se
Thu Jul 23 22:37:56 CEST 2015
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
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
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.
This is the line I got stuck on, with the error message below.
cfg = ft_definetrial(cfg);
Warning: could not determine filetype of
> 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:
trialdef: [1x1 struct]
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