[Eeglablist] exporting markers latency and epoching boundaries

[Tarik S Bel-Bahar]

Here are some quick thoughts, hope they help.

In general, it should be fine if your segments overlap a bit,
but it depends also to some degree on the analyses you plan.
For example if you are really only interested in
Marker 1 for computing your epochs, then you are fine.
However, you may want to rename the Marker 3 event
so that it does not get mixed up with the Marker 1 event.


For exporting events you already have in eeglab, there are several ways.
you can try the two following functions:
eeg_getepochevent  or eeg_eventtable
You can also simply make a loop that goes through each
event, and writes the event field of choice to a matlab array or two,
and that should also be saveable and importable,
as long you make sure you format the resulting file to the specifications
you
require for "importing into another program"


On Wed, Apr 25, 2012 at 2:44 PM, ida miokovic <ida.miokovic at gmail.com>wrote:

> Hi everyone,
>
> to shorten the story =) I have two questions:
>
> 1. Is it possible somehow to export marker events (their latency) I put
> manually (Edit --> Visually edit events and identify bad channels) into the
> data and import them to other dataset?
> I have a sensor measuring the activity I am interested in which of course,
> gives as an output signal with much higher amplitude than eeg signal.
> Because of that, I am plotting it separated from eeg signal, in order to
> see its shape and to be able to put some additional markers in accordance
> with the signal of the sensor. Since it is plotted (and imported into)
> EEGLAB separated from eeg signal, I am not sure how to import new marker
> events allocated in sensor signal to another dataset (eeg) which is to be
> analysed.
>
> 2. When determining the limits of the epochs to extract (around the event
> markers) do I have to take care that two epochs do not have boundaries that
> overlap? If yes, please give some short explanation, if not - then great =)
> Example: Marker1 happened in 1st second and Marker2 in 3rd second. If I
> put -1 and 2.5 as an epoch boundaries there will be some overlapping.
>
> Thank you in advance (answers from my previous questions were of a great
> great help to me).
>
> Ida
>
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