[Eeglablist] Questions about epochs and scripts

[Stephen Politzer-Ahles]

I remember there have been previous discussions about similar problems as
yours, so you can search the EEGLABLIST archives and find some solutions.
One was to add arbitrary events, another was to use a built-in EEGLAB
function to split up the signal into equal-length segments.

Your question doesn't really make sense to me because it sounds like you
have stimuli of interest already; if so, normally one would have already
had events in the data file to mark when these stimuli occur (most EEG
acquisition programs can interface with experiment control programs to put
these event markers in the data). If you don't have those already, then you
need to have some record of when every stimulus occurred.


---
Stephen Politzer-Ahles
The Hong Kong Polytechnic University
Department of Chinese and Bilingual Studies
http://www.mypolyuweb.hk/~sjpolit/
<http://www.nyu.edu/projects/politzer-ahles/>

On Wed, Dec 28, 2016 at 7:07 PM, 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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