[Eeglablist] how to add markers in continuous EEG data

[Scott Makeig]

Humara -

You may be interested to learn about using the HED system ('Hierarchical
Event Descriptors') to attach  more detailed descriptions of your recorded
(or post hoc annotated) events to your data that can stay with the data for
its entire life, which may exceed your uses for it if you share it in an
open data archive such as the U.S. OpenNeuro.org and thence its
EEG/MEG/iEEG portal, NEMAR.org. EEGLAB has HED tools to search for classes
of events based on their HED tags, extract data epochs time locked to those
events, etc. HED tag annotations are explicitly accepted in all the BIDS
modality formats including BIDS-EEG. Learn more at HEDtags.org.

Scott Makeig

On Tue, Jun 20, 2023 at 10:29 PM Lue, James C. via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi Humera,
>
> I think the way that event markers are associated with EEG data will vary
> depending on the type of system one uses. My lab uses EGI Geodesic sensor
> nets. Net Station produces a .mff file, which is like a .zip file. Inside,
> in addition to the recording, is an .xml file for user-initiated event
> markers.
>
> There were times I had to edit this file to add event markers that were
> inadvertently missed during the session. Having said that, I've never
> actually created one from scratch in the case where no event markers were
> pressed at all. You might want to look at one of your older recordings that
> have event markers to get an idea of how the event file is formatted.
>
> James Lue
> ________________________________
> From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of Humera
> Sharif via eeglablist <eeglablist at sccn.ucsd.edu>
> Sent: Saturday, June 17, 2023 6:19 AM
> To: eeglablist at sccn.ucsd.edu <eeglablist at sccn.ucsd.edu>
> Subject: [Eeglablist] how to add markers in continuous EEG data
>
> Hi,
>
> I have collected continuous EEG data. For some reason, I could not add
> stimulus markers to it. Could anyone help me how to add markers afterwards
> in my data?
>
> Thanks in advance!
>
> Best regards
> Humera Sharif
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation, University of
California San Diego, La Jolla CA 92093-0559, http://sccn.ucsd.edu/~scott