<div dir="ltr">Dear Makoto,<div>Thanks for your response. The data does not have DC offset as everything below 1 Hz was completely removed. eegplot seem to snap the scale with respect to the channel with the highest amplitude,; the channels with small amplitude appears flat. The issue is that whenever I input an arbitrary scale value, it snaps back to its own auto scale value.</div><div><br></div><div>I am happy to share my data with this issue, but if I am the only one having the issue perhaps I can just carry on viewing data directly on matlab for now.</div><div><br></div><div>Thanks</div><div>Bethel</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 13, 2018 at 7:55 PM, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Bethel,<div><br></div><div>Sorry for the trouble.</div><span class=""><div><br></div><div><div style="font-size:small;background-color:rgb(255,255,255)">> When I open the recording the eegplot just snap to certain</div><div style="font-size:small;background-color:rgb(255,255,255)">scale which do not necessary allow me to correctly visualise the data</div><div style="font-size:small;background-color:rgb(255,255,255)">amplitude. Using the +- buttons to change the scale does not have any</div><div style="font-size:small;background-color:rgb(255,255,255)">effect.</div><br></div></span><div>My initial guess is that the data have huge DC drift.</div><div>Try this: in eegplot() GUI, in the top tab, [Display] -> [Remove DC offset].</div><span class=""><div><br></div><div><span style="font-size:small;background-color:rgb(255,255,255);float:none;display:inline">> This could be because the amplitude in some channels are very high compared with others.</span><br></div><div><br></div></span><div>Even if amplitude is high, as long as they are AC they should frequently cross the zero line, hence I guessed DC offset is present. If you recorded the data without using high-pass filter... DC drift could be up to 10,000 uV. High-pass filter removes it as well. Try these solutions and let me know if it works.</div><div><br></div><div>Makoto</div><br><div class="gmail_quote"><div><div class="h5"><div dir="ltr">On Thu, Jul 12, 2018 at 10:32 AM Bethel Osuagwu <<a href="mailto:bethel.osuagwu@gmail.com" target="_blank">bethel.osuagwu@gmail.com</a>> wrote:<br></div></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div>Dear All,</div><div>I posted this some time ago and had no response; I am posting again because I think this could be a bug.</div><div><br></div><div>I am using EEGLAB(v13.5.4b) to process data and am struggling to scale trace</div><div>amplitudes. When I open the recording the eegplot just snap to certain</div><div>scale which do not necessary allow me to correctly visualise the data</div><div>amplitude. Using the +- buttons to change the scale does not have any</div><div>effect. Also using the input field to change the scale does not work as the</div><div>input field only snap to certain values. This could be because the amplitude in some channels are very high compared with others. I keep having to plot the data using matlab plot in other to visualise it.</div><div><br></div><div>How can I change the scale to any arbitrary value so to see the trace</div><div>amplitudes nicely?</div><div><br></div><div>Thanks</div><div><br></div><div><br></div>-- <br><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><font face="tahoma, sans-serif" style="font-size:12.8px"><font color="#000000" size="1"><b>Bethel A. C. Osuagwu</b></font></font><div style="font-size:small"><font face="tahoma, sans-serif" size="1">Clinical Research Fellow</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b>Stoke Mandeville Spinal Research</b></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">National Spinal Injuries Centre</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Mandeville Road</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Aylesbury</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Bucks</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">HP21 8AL</font></div><div><font face="tahoma, sans-serif" size="1">Tel: 01296 31 5963 (</font><span style="font-family:tahoma,sans-serif;font-size:x-small">Applied NeuroLab)</span><font face="tahoma, sans-serif" size="1"><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b><u><a href="http://lifeafterparalysis.com/" style="color:rgb(17,85,204)" target="_blank">lifeafterparalysis.com</a></u></b></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif"><div style="color:rgb(0,0,0);display:inline"><font size="1">@lifeafterpara</font></div><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b><u><a href="http://justgiving.com/smsr" style="color:rgb(17,85,204)" target="_blank">justgiving.com/smsr</a></u></b></font></div></div></div></div></div></div></div>
</div></div></div>
______________________________<wbr>_________________<br>
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" rel="noreferrer" target="_blank">http://sccn.ucsd.edu/eeglab/<wbr>eeglabmail.html</a><br>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu" target="_blank">eeglablist-unsubscribe@sccn.<wbr>ucsd.edu</a><br>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu" target="_blank">eeglablist-request@sccn.ucsd.<wbr>edu</a></blockquote></div><span class="HOEnZb"><font color="#888888"><br clear="all"><div><br></div>-- <br><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div></div></font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><font face="tahoma, sans-serif" style="font-size:12.8px"><font color="#000000" size="1"><b>Bethel A. C. Osuagwu</b></font></font><div style="font-size:small"><font face="tahoma, sans-serif" size="1">Clinical Research Fellow</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b>Stoke Mandeville Spinal Research</b></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">National Spinal Injuries Centre</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Mandeville Road</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Aylesbury</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">Bucks</font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1">HP21 8AL</font></div><div><font face="tahoma, sans-serif" size="1">Tel: 01296 31 5963 (</font><span style="font-family:tahoma,sans-serif;font-size:x-small">Applied NeuroLab)</span><font face="tahoma, sans-serif" size="1"><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b><u><a href="http://lifeafterparalysis.com/" style="color:rgb(17,85,204)" target="_blank">lifeafterparalysis.com</a></u></b></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif"><div style="color:rgb(0,0,0);display:inline"><font size="1">@lifeafterpara</font></div><br></font></div><div style="font-size:12.8px"><font face="tahoma, sans-serif" size="1"><b><u><a href="http://justgiving.com/smsr" style="color:rgb(17,85,204)" target="_blank">justgiving.com/smsr</a></u></b></font></div></div></div></div></div></div></div>
</div>