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<p class="MsoNormal">Hey everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to compare ERPs from the 1<sup>st</sup> half to the 2<sup>nd</sup> half of my task. I have been attempting to do this
<i>after </i>binning and artifact detection. Per a previous post from the erplab email list, I tried using the epoch subset assistant from the compute average ERPs operation. However, this requires you to specify the number of trials per bin to keep. The way
my data are binned, the number of epochs per bin varies within and between subjects. I just want to simply create a separate ERP for the first half of the epochs (say, epoch 1:1296) and one for the second half of the epochs (1297:2592) – but you cannot do
this using the compute average ERPs operation. So, I tried manually splitting the post-artifact detection .set file in eeglab using edit>select data>epoch range, and saving two new .set files for the 1<sup>st</sup> half and 2<sup>nd</sup> half. Then, I tried
computing average ERPs for each half using erplab. However, after splitting the file the artifact detection information appears to be gone. So, I re-ran artifact detection on these separately and tried computing average ERPs again. This time, a warning occurs
informing me that it cannot use the new artifact detection information because it is retaining the old information from before it was split and can only reject those trials. This is likely fine for the 1<sup>st</sup> half of the trials, but when I split the
file in two, the first trial of the 2<sup>nd</sup> half changes from trial 1297 (for example) to trial 1. If it is applying artifact detection and rejection to this second half using the trial information from the original dataset, the same exact trials/epochs
will be rejected for the 1<sup>st</sup> half and 2<sup>nd</sup> half, which is a problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have advice on what to do? There <i>must </i>be a simple way to split the file in half by epochs and get new ERPs. Right? I’m trying to avoid going all the way back in the process to split the original eeg file.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Ken<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222">--<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222">Kenneth Bennett, MS<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222">Fifth Year Clinical Graduate Student<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:black">Affective Neuroscience Laboratory</span><span style="font-size:10.0pt;color:#222222"><br>
Department of Psychology<br>
University of Wisconsin-Milwaukee<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222">334 Garland Hall<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:middle"><span style="font-size:10.0pt;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#222222">CONFIDENTIALITY NOTICE: </span></b><span style="font-size:10.0pt;color:black">This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain
confidential or proprietary information which is legally privileged. Any unauthorized review, use, disclosure, or distribution is prohibited. If you are not the intended recipient, please promptly contact the sender by reply e-mail and delete the message.</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
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