[Eeglablist] Retreive detailed event info for EGI epoched recordings

Mike Hartman mhartman at egi.com
Wed May 12 15:34:40 PDT 2010


Dear Pavel,

 

the simple binary format only stores the 4-character label of each event,
and the index, of course.The additional components of the events are not
stored.

 

On the EGI website you can get the File Formats manual which explains this
in detail.

 

Using the 'Segmentation Markup' feature in the Net Station Software Waveform
Tools, you can create a new event track in the Net Station file, and have
that track contain new events which are derived from the original events
according to rules that you specify. This is covered in the manuals as well,
but please feel free to contact EGI support for more direction on how to
achieve what you want:

 

supportteam at egi.com

 

PS, depending on which version of Net Station you are using, you can export
the simple binary file as 'epoch-marked'. Then you do not get multiple
simple binary files, only one, and it has events that indicate the epoch
boundaries.

 

Thanks!

 

Michael Hartman

Electrical Geodesics, Inc.

 

From: eeglablist-bounces at sccn.ucsd.edu
[mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Pawel Augustynowicz
Sent: Wednesday, May 12, 2010 12:04 PM
To: eeglablist at sccn.ucsd.edu
Subject: [Eeglablist] Retreive detailed event info for EGI epoched
recordings

 

Dear All,

 

I have a short question about import data from EGI simple binary file format
with events. By default, EEGLAB imports EGI's simple binary with events, but
in only one dimension. I mean, that I can see only the name of the event.
Additional data (event fields) are not imported. Does anyone have an idea of
how to attach this data do EEGLAB? I assume that this information is written
in additional channels. But EEGLAB deletes all of these channels except one
with the basic info. 

I tried to insert this data manually, by there is another problem. I have a
few epochs in original NetStation recording. These epochs are essential
because of the experiment design (experiment is too long and we have to do
breaks). When I export this data from NetStation as simple binary, this file
is being broken into files representing epochs in original recording. I can
import this bunch of files with pop_readsegegi command. This function does
the job well, except one little bug: NetStation counts time from the
beginning of the experiment. Pauses during the recording are treated as the
beginning of epochs. In EEGLAB all epochs have continuous time, so there is
no possibility to attach events exported from NetStation, because the time
after the first epoch is different. 

 

Does anyone ran on these problems and managed to resolve it?

 

Regards,

Pawel Augustynowicz

The John Paul II Catholic University of Lublin

 

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