[Eeglablist] Importing events from Netstation

[Stephen Hamilton]

Dear all,

Apologies for my tardy reply to your helpful suggestions. In the end, we
followed Gabriela Cruz's advice and performed segmentation mark-up in
Netstation before exporting the data files into .raw format. This was
mostly straightforward, but we did have some problems reading accuracy
information from the TRSP events (given by Netstation) into EEGlab,
particularly when these events occurred at recording boundaries. No error
messages came up, we just noticed that there weren't enough trials in each
condition and then saw that some TRSP events did not contain accuracy
evaluations. As a consequence, most participants were missing 2 accuracy
labels per recording.

We determined the accuracy of these missing responses by inspecting the
original event files given by NetStation. We then updated the eventlists
produced by EEGlab by manually inserting correct and incorrect labels in
place of the (empty) TRSP events. These modified event lists were then
re-imported into EEGlab, and we were able to bin trials by accuracy and
condition without any hassle.

Thank you all for your help with this, we really appreciate it.

S Hamilton

On Tue, Sep 25, 2012 at 4:08 PM, Tarik S Bel-Bahar
<tarikbelbahar at gmail.com>wrote:

> Hi, please let the list know of your final solution, here are some quick
> suggestions
>
> 1. Search deeper into the eeglab list archives regarding importing/reading
> EGI/Netstation files/events.
> Alternatively search on google for a combination of "eeglablist" and
> "EGI/netstation/.RAW/events"
> To date (netstation 4.4 and back) only the main event labels are imported
> into eeglab
> and not the rich TRSP information. it's just a matter of formats, etc..
>
> 2. The new Netstation (5.0?) has a new format which will purportedly allow
> for easy recognition of the dense TRSP information that is available in
> Netstation files.
> See also EPToolkit (and eeglablist archives on EPtoolkit)
>
> 3. One alternative is to export your events from netstation as a separate
> text file,
> and then, via your own script, coordinate the events/TRSPs information
> from this text file
> with your eeglab file.
> For example, if you 1000 events in your file, each with multiple TRSP
> fields,
> you would simply have to, with matlab, import your netstation events file,
> and then find the 1st event in eeglab, the 1st event in your events file
> (in matlab now),
> and then add fields of choice to your eeglab file from the events file.
>
> This solution is for continuous data from Netstation,
> but this should also work with epoched data from NS imported into eeglab.
>
>
>
>
> On Thu, Sep 20, 2012 at 6:14 PM, Stephen Hamilton <sthamilton at ucdavis.edu>wrote:
>
>> Dear all,
>>
>> This is probably a very simple question with a straightforward answer,
>> but I can't find it mentioned in previous posts. Apologies if I've missed
>> it.
>>
>> I'm importing data recorded in Netstation (128 channel EGI system) into
>> EEGlab so that I can reject artifacts using ICA. With Netstation, events
>> are written into the .RAW files themselves, so I'm able to segment the data
>> by condition very easily. However, I'm unable to distinguish correct trials
>> from incorrect trials. When I try to import the event file given by
>> Netstation, EEGlab doesn't like the fact that it's in string
>> format. So, I've tried assigning events manually using the eventlist GUI
>> provided by the ERPlab toolbox, but I'm unable to get it to read the
>> accuracy information. This is, I think, because EGI/Netstation evaluates
>> trial accuracy with TRSP events at the end of each trial and these
>> evaluations are not tied to the condition labels themselves. If I open the
>> Netstation event file the TRSP evaluation ("eval1" or "eval0") is provided
>> at the end of the line for that event,  I just can't get EEGlab to read
>> it. It's probably just a matter of tying these together in the Binlister
>> somehow, but I can't find an example of how this is done.
>>
>> Again, sorry if this has been answered before. Any help would be much
>> appreciated!
>>
>> S Hamilton
>>
>>
>> --
>> Dr. Stephen Hamilton
>> Postdoctoral Researcher
>> Language Processing Lab
>> University of California, Davis
>>
>>
>>
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>
>


-- 
Dr. Stephen Hamilton
Postdoctoral Researcher
Language Processing Lab
University of California, Davis
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