[FieldTrip] appending data from two recordings

[Eelke Spaak]

Hi Phyllis,

The way I would approach this is to segment the data for both data
files separately, making sure that all relevant information is stored
in the .trialinfo field. If you write your own trialfun, then any
information you store in the 4th and upward column of the trl matrix
will end up in data.trialinfo when doing ft_definetrial and
ft_preprocessing.

Then you can simply use ft_appenddata to append the data sets and all
should be fine. Even though the events are removed (which they must
be, as their time stamps are coded in terms of samples from the onset
of recording), you still have the information in trialinfo.

Would that work?

Best,
Eelke

On 14 March 2014 11:47, Phyllis Mania <phyllis.mania at uni-hamburg.de> wrote:
> Hi all,
>
>
>
> I've been trying to append data from two datasets that were read in and
> segmented into trials separately.
>
> Whenever I do so all events get mixed up, i.e., eventvalues that were not
> specified for ft_definetrial (and ft_redefinetrial) show up in the
> databrowser and the original events of interest are not aligned to 0
> anymore.
>
> The warning I get is "input data comes from different datafiles; removing
> sampleinfo field".
>
>
>
> Is there another way to combine data from different recordings? I use Vision
> Recorder and subjects need to take a break during the experiment, which is
> why I end up with two datasets in the first place.
>
>
>
> I figured that combining the datasets before defining trials would be more
> efficient anyway but then I don't know how to read in all events (since
> ft_definetrial requires one dataset).
>
>
>
> Thanks in advance!
>
> Phyllis
>
>
>
>
>
>
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