<div dir="ltr">Dear Min,<div><br></div><div>Sorry for delay.</div><div>Well, the number of epochs and events could be different.</div><div>If you have event A every 1 seconds for 100 times. If you epoch +/- 500 ms, you'll have 100 epochs and 100 events i.e. one event per epoch. If you epoch +/- 1000 ms, you'll have 100 epochs and 300 events because your 3 second epoch now contains n-1th, nth, and n+1th event.</div>
<div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/10/28 Stephen Politzer-Ahles <span dir="ltr"><<a href="mailto:politzerahless@gmail.com" target="_blank">politzerahless@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hi Min,<br><br></div>This depends on some options that you select while epoching. For example, it's possible that EEGLAB may not have made two epochs out of two identical events that are close together (there is an option for that) or events occurring very early or late in the recording (there are also options for that). It would be helpful if you could provide more information about the commands that you called for epoching.<br>
<br></div>best,<br></div>Steve<span class="HOEnZb"><font color="#888888"><br></font></span></div><div class="gmail_extra"><span class="HOEnZb"><font color="#888888"><br clear="all"><div><div dir="ltr"><div><br></div><div>
<br></div>Stephen Politzer-Ahles<br>New York University, Abu Dhabi<br>Neuroscience of Language Lab<br>
<a href="http://www.nyu.edu/projects/politzer-ahles/" target="_blank">http://www.nyu.edu/projects/politzer-ahles/</a><br></div></div>
<br><br></font></span><div class="gmail_quote"><div><div class="h5">On Sat, Oct 26, 2013 at 12:53 AM, Min Sheng <span dir="ltr"><<a href="mailto:Min.Sheng@utsouthwestern.edu" target="_blank">Min.Sheng@utsouthwestern.edu</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 class="h5">
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<p>Dear all,</p>
<p>I am new to EEG process, I am a little confused about the epoch and the event. When I use eeglab to extract epochs from raw data, I thought the number of event and the epoch should be the same, but it didn't. For example, if I extracted
'S32' epochs and generated new data set, it showed that the number of epochs is 755 while the number of events is 758. However, the VMRK file shows the number of 'S32' should be 756. It happened when there were some other markers mixed (like 'buffer overflow')
during the recording.</p>
<p> </p>
<p>Best regards,</p>
<p>Min sheng</p>
<p class="MsoNormal"> </p>
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-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div>
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