[Eeglablist] exporting markers latency and epoching boundaries

[ida miokovic]

Hi Tarik,

thank you for your answer.

Regarding overlapping of the segments, I did not presented it well when I
wrote the different names of the markers since markers I am talking about
present the same subject's "activity" (so all of them are for example M1).
They are of a same kind and since they are not homogeneously distributed, I
have some parts where I will surely have some epoch overlapping (and if I
put smaller epoch boundaries, I wouldn't get enough information).

Regarding markers exporting, I solved the problem without any exporting and
importing. I simply put the markers (Edit --> Visually edit markers and...)
on the sensor signal (which is loaded together with the rest of eeg signals
in one EEGLAB dataset) and afterward I just erased sensor signal, but the
markers remained, which is exactly what I needed.

Thank you very much for your suggestions,

All the best

Ida

On Fri, Apr 27, 2012 at 7:27 PM, Tarik S Bel-Bahar
<tarikbelbahar at gmail.com>wrote:

> 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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