<div dir="ltr"><div class="gmail_default" style="color:rgb(51,51,153)">Hello Julia, Some notes below that might help. cheers.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">*********************************</div><div class="gmail_default" style="color:rgb(51,51,153)">Using Netstation is probably simplest here. One way might be to create new "extra" events (e.g., your "true/correct 0 time event) within Netstation before export to Netstation. This can be done manually, or automatically via the segmentation waveform tool. These extra events should show up at wherever you create them within each segments. You should be able to do add these events within the continuous data or epoched data, both within NS. In the segmentation tool, there should be an option to not create segments but rather create new events based on the segmentation tool specs.Then these should export into eeglab too. <br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Within eeglab, you can simply go the GUI, and add single events at the correct locations. This is also scriptable if you examine the result of the eegh command after successfully inserting an event via the eeglab gui.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Also possible with eeglab: Create new events as well that are at the correct time in the segments/epochs. This may also involve modifying the values of the times. Alternatively, you could export the continuous data from netstation, and then also process/add/change events and segment/epoch all within eeglab. Alternatively, also within eeglab, you could read a text file with new events, and add these events to the correct place in each segment. If you haven't had a chance to, to start, google past eeglablist postings and review the online tutorial for info regarding adding events, coding, scripting, etc...</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">Although it's unclear to me from your note, one possible problem you might be having is that you want your segments/epochs to be generated so that they each the same length (such as 2 or 3 seconds), or that they all have the correct 0 time at the same location within the segment, or both. I think what you need is segments that are all the same length of time, and where the time before or after 0 within each segment is variable.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)">I assume your issue is not about jitter of the stimulus onset, as that should present no problem for 0 time locking.How eeglab is reading the epochs you export from Netstation may also depend on exactly what "time" (e.g., relative time) in the NS segmentation tool or file export tool settings.<br></div><div class="gmail_default" style="color:rgb(51,51,153)">*********************************************************</div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div><div class="gmail_default" style="color:rgb(51,51,153)"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 25, 2016 at 3:01 PM, julia campbell <span dir="ltr"><<a href="mailto:julia.d.campbell@gmail.com" target="_blank">julia.d.campbell@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 style="word-wrap:break-word">Hello all,<div><br></div><div>I am working with exporting .raw files from EGI Netstation to EEGLab.</div><div>Before I export the Netstation files, I high-pass filter the continuous file and then ‘segment’ the data to create epochs.</div><div>My stimuli have timing offsets that are programmed into the segmentation process in Netstation.</div><div>As a result, when I examine the data in EEGLab, I have a stimulus marked as occurring before 0 ms latency.</div><div>How can I mark 0 ms as the same point that the stimulus occurs?</div><div><br></div><div>Thank you for your help!</div><div><br><div>
<div><div style="font-family:Calibri,sans-serif;font-size:14px"><b>Julia Campbell, Ph.D, Au.D, CCC-A, F-AAA</b></div><div style="font-family:Calibri,sans-serif;font-size:14px"><b>Assistant Professor</b></div><div style="font-family:Calibri,sans-serif;font-size:14px"><b>Communication Sciences and Disorders</b></div><div style="font-family:Calibri,sans-serif;font-size:14px"><font color="#ff6600"><b>The University of Texas at Austin</b></font></div></div>
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