[Eeglablist] Questions about epochs and scripts

[Makoto Miyakoshi]

Dear Luigi,

Yeah it's annoying that if  you don't have any event then you can't create
event information. It's a a falut of the design, so you can file it as a
bug, if you can nicely volunteer.
https://sccn.ucsd.edu/bugzilla/enter_bug.cgi

There are a few ways to solve this: 1) Create a dummy event structure by
coding just to make the event edit GUI work, 2) Generate event info with
Excel and import it to EEGLAB. Probably 2) is more proper and supported way
to go.  You can do this from EEGLAB main GUI, 'File' - 'Import event info'.

Dear Stephen,

> another was to use a built-in EEGLAB function to split up the signal into
equal-length segments.

Hmm that could be eeg_regepoh(), but it's not partucularly useful for this
purpose. In addition, when I recently used it, it did not work well when I
specify 10 s epoch for example... or maybe I did not understand how to use
it even though I read the help file 5 times i.e. probably some kind of bug
is there and segmenting the data into 1-s is the only confirmed good
behavior. I don't know what was wrong.

>From Lufthansa455 to Frankfurt,

Makoto

On Wed, Dec 28, 2016 at 3:07 AM, Luigi Pavone <gi19gi82 at gmail.com> wrote:

> Hello everybody,
>
> I'm new in eeglab, I would like to ask you some questions.
>
> I have a continuos 17 channels EEG signal.
>
> I would like to extract epochs from that signal. Each epoch has length of
> 500 msec and starts 100 msec before the stimulus and last 400 msec after
> the stimulus.
>
> I have in total about 180 of such epochs.
>
> I've tried to extract epochs from EEG using "Extract Epochs" function from
> "Tools" menù, but eeglab ask me to define events first.
>
> How can i define events and then epochs in such way?
>
> I've tried to read from tutorials, but i didn't find (at least until now)
> something that explain how to do this.
>
> Thank you so much in advance.
>
> Best regards,
>
> Luigi Pavone
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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