<div class="gmail_extra">Ida,<br><br>To examine event-related potentials you need an event to time-lock the EEG to; in your case it sounds like what you need is events that indicate the participant's response (events that are added to the data when the participant presses a button or does something like that). Without those events indicating when exactly participants made responses, as far as I know there is no way to examine event-related potentials based on when they were performing the task. Some other less timing-precise measures may be possible, but that's not my area of expertise and I'm not sure how to do it; I think to be of more help I would need to know what specifically you are intending to measure.<br>
<br>Best,<br>Steve Politzer-Ahles<br><br><div class="gmail_quote">On Mon, Apr 23, 2012 at 1:53 AM, ida miokovic <span dir="ltr"><<a href="mailto:ida.miokovic@gmail.com" target="_blank">ida.miokovic@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_extra">Hello Steve,<br><br>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:<br>
<br>.<br>.<br>S1 (start performing task whenever you want)<br>10 secs <br>S11 (stop performing task)<br>30 secs of break <br>S1<br>10 secs<br>S11<br>30 secs of break<br>.<br>.<br><br>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?<br>
<br>I am beginner in EEGLAB, so this is probably basic question.<div class="im"><br><br>Thank you once again.<br><br>Ida <br><br></div>But my only information of certain period when that period of 10 seconds<div><div class="h5">
<br><br><div class="gmail_quote">On Mon, Apr 23, 2012 at 7:56 AM, Stephen Politzer-Ahles <span dir="ltr"><<a href="mailto:politzerahless@gmail.com" target="_blank">politzerahless@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_extra">Hello Ida,<br><br>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.<br>
<br>
Best,<br>Steve Politzer-Ahles<br><br><div class="gmail_quote"><div><div>On Sun, Apr 22, 2012 at 4:55 AM, ida miokovic <span dir="ltr"><<a href="mailto:ida.miokovic@gmail.com" target="_blank">ida.miokovic@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>Hello everyone,<div><br></div><div>I already posted one question when I remembered I have more of them. So, here it is:</div>
<div><br></div><div>- 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.</div>
<div><br></div><div>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"? </div>
<div><br></div><div>Thank you once again.</div><span><font color="#888888"><div><br></div><div>Ida</div>
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</blockquote></div><br><br clear="all"><br>-- <br>Stephen Politzer-Ahles<br>University of Kansas<br>Linguistics Department<br><a href="http://www.linguistics.ku.edu/">http://www.linguistics.ku.edu/</a><br>
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