[Eeglablist] Merging two datasets with unequal numbers of events

[Makoto Miyakoshi]

Dear Elizabeth,

> It seems then that Event List is doing something to the urevent structure
perhaps? I’m not really familiar with the idea of urevent.

At least this part I can help you--The prefix 'ur-' means in German
original.
urevent is information of original events. For example, EEG =
eeg_checkset(EEG, 'makeur') forces the EEG.urevent to be re-created.

Makoto

On Mon, Oct 31, 2016 at 2:46 PM, Elizabeth Spencer Norton <
enorton at northwestern.edu> wrote:

> Hi Tarik,
>
> Thanks for your suggestions.
>
>
>
> Everything is the same with the two files except the length. I tried
> merging the data before running any Event List/Bin List procedures as part
> of ERPLab and that does work successfully, even with unequal numbers of
> events per file. However, after generating ERPLab Event Lists, the
> appending does not work, and I get the same error that I posted originally.
> After running the Event List, there are a listed number of events in the
> EEGLab GUI display. Everything else about the two files (sampling rate,
> etc.) is the same. It seems then that Event List is doing something to the
> urevent structure perhaps? I’m not really familiar with the idea of urevent.
>
>
>
> My overall issue is that the two files (two runs) have the same event
> codes, but I want to later be able to bin the events by which run they were
> in so that I can create an ERP difference wave. I could keep the two runs
> separate and then append them once they are averaged in ERPLab, but I
> figured that it would be easier to do artifact detection/rejection as one
> file rather than two.
>
>
>
> Thanks for any additional ideas.
>
> Elizabeth
>
>
>
> *From: *Tarik S Bel-Bahar <tarikbelbahar at gmail.com>
> *Reply-To: *<tarikbelbahar at gmail.com>
> *Date: *Thursday, October 27, 2016 at 2:22 PM
> *To: *Elizabeth Spencer Norton <enorton at northwestern.edu>
> *Cc: *"eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
> *Subject: *Re: [Eeglablist] Merging two datasets with unequal numbers of
> events
>
>
>
> Hi Elizabeth, some notes below that might help. this shouldn't be a
> problem, and if it's repeatable please consider reporting in eeglab
> bugzilla.
>
>
>
> The error of course suggests that one of your files does not have
> urevents, which I think are/should-be generated when a file is first loaded
> and saved in eeglab.
>
> I recommend making sure that you've done the following, which should lead
> you past this error.
>
>
>
> importing, epoching, and saving the two files the same way as much as
> possible, so there is nothing different between them except the number and
> type of epoch.
>
> both files should have a "number of epochs" in the eeglab gui
>
> both files "should" have an urevents field (unless there were no events in
> the file used originally?-not sure about this, see online wiki on events
> and urevents)
>
> both files should have an 3-dimensional EEG.data structure
>
> both files should have the same-length epochs
>
> both files should already be healthily saved and re-openable in eeglab as
> .set files, prior to attempt at merging
>
> both files are actively in memory as Datasets 1 and 2 (or however many
> datasets you're merfing.
>
>
>
> Other than this, first two a successful mergeset and review the command
> that was run using eegh. Try it on two files that are copy of each of other.
>
> You may also attempt to comment out line 275 or near there in the code to
> attempt to bypass the error, but this is NOT recommended unless you're
> matlab saavy and can read the full function code.
>
>
>
>
>
>
>
> On Wed, Oct 26, 2016 at 2:44 PM, Elizabeth Spencer Norton <
> enorton at northwestern.edu> wrote:
>
> Hello,
>
> I'm trying to merge (concatenate) two datasets with different numbers of
> events. We run an oddball paradigm with randomly selected number of
> standards between deviants, and this is done in two runs that have
> different stimuli. I'm trying to concatenate the two runs using the GUI
> which calls pop_mergeset, but getting the error popup "EEGLAB error in
> function pop_mergeset() at line 275: Reference to non-existent field
> 'urevent'."
>
>
>
> Looking at the pop_mergeset script, it looks like it wants to merge the
> files and insert a boundary event halfway through (lines 224-228), which
> may be the problem with using two files of unequal length. (Using EEGLab
> version 13.6.5.)
>
>
>
> I'd prefer not to just lop off events from the longer dataset to make the
> sizes match. If anyone has ideas for other solutions, I would appreciate it!
>
> Best,
>
> Elizabeth Norton
>
> Northwestern University
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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