[Eeglablist] question regarding epochs extracting

[ida miokovic]

Hello Steve,

thank you very much for your response. Yes, that is my plan - to see what
is happening during that period of approx 10 secs (it is not in a second
precise) when participants are performing tasks. It looks similar to this:

.
.
S1 (start performing task whenever you want)
10 secs
S11 (stop performing task)
30 secs of break
S1
10 secs
S11
30 secs of break
.
.

I am not sure how else to extract epochs but with the markers already in
the data, since I do not have other input of when exactly the subject
performed the task (I only now they performed it several times within
marked 10 seconds). Can you please be more specific with your suggestion?

I am beginner in EEGLAB, so this is probably basic question.

Thank you once again.

Ida

But my only information of certain period when that period of 10 seconds

On Mon, Apr 23, 2012 at 7:56 AM, Stephen Politzer-Ahles <
politzerahless at gmail.com> wrote:

> Hello Ida,
>
> Are you planning to get ERPs locked to participants' responses? If so, you
> can just extract epochs using the participant responses, rather than S1 and
> S11, as the events.
>
> Best,
> Steve Politzer-Ahles
>
> On Sun, Apr 22, 2012 at 4:55 AM, ida miokovic <ida.miokovic at gmail.com>wrote:
>
>> Hello everyone,
>>
>> I already posted one question when I remembered I have more of them. So,
>> here it is:
>>
>> - I am working with eeg recordings where subjects performed tasks
>> whenever they wanted during a period within two events (markers). I plan to
>> do the filtering of the data (lowpass and notch) and to re-reference them
>> to the average data (ref electrode was Cz). After that, I should do the
>> epochs extracting, but as I understand EEGLAB does that (within GUI) for
>> each event in defined interval before and after the event.
>>
>> My problem is that I have for example two events - S1 and S11 which
>> denote start and the end of the experiment. After S1 occurs, 10 seconds (or
>> similar) after S11 occurs and the subjects are performing tasks within that
>> period whenever they want. Is there a way for me to say "extract epochs
>> between events S1 and S11"?
>>
>> Thank you once again.
>>
>> Ida
>>
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>
>
>
> --
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
>
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