[Eeglablist] How to keep urevent information even after epoching

[Michelle Lee]

Hi Arnaud,

Yes I was finally able to see some ERPs after running through the pipeline.
The way I had formatted some of my data was giving me these problems so I
think you were right.
Thank you for your reply!

Regards,

Michelle

On Tue, Jul 17, 2018 at 9:53 AM Arnaud Delorme <arno at ucsd.edu> wrote:

> Dear Michele,
>
> It is unlikely that the problem is with epoching. These are the 8 test
> cases (programs) that run every night and check the integrity of the
> epoching function.
>
>
> https://sccn.ucsd.edu/svn/eeglab-testcases/trunk/unittesting_general/unittesting_popfunc/pop_epoch/
>
> https://sccn.ucsd.edu/svn/eeglab-testcases/trunk/unittesting_general/unittesting_sigprocfunc/epoch/
>
> Also it is a simple function. You can actually check yourself by zooming
> in on the data surrounding one event before and after epoching and check
> that it is the same. If there is a problem with event latencies, it
> probably occurs either when the events are written along with the raw data
> or when they are imported.
>
> Best wishes,
>
> Arno
>
> > On Jul 13, 2018, at 6:15 AM, Michelle Lee <michelle.lee98 at gmail.com>
> wrote:
> >
> > Hello everyone,
> >
> > I am having some trouble with my ERPs in that none of them seem have a
> P1, P2 or EPN at all. We expected at least a little consensus to this
> pattern for all of our conditions.
> > We think the problem lies in the latencies -somehow they were all
> changed after epoching.
> >
> > I did some research and someone mentioned how it was important to keep
> all original information in the EEG.urevent structure so that all original
> info (including latencies I'm assuming) will remain with the data even
> after epoching and manually removing trials.
> >
> > However I don't really know how I can achieve this; by default, eeglab
> seems to change the EEG.urevent timeline.
> > If anyone can provide any insight I would be very grateful!
> >
> >
> > Thanks,
> >
> > Michelle
> >
> >
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