<div dir="ltr">Dear Doron,<div><br></div><div>It is known that if the data have large artifacts or large low-frequency drift (i.e. &#39;baseline drift&#39;), it affects the spectopo plot like that. Apply high-pass filter around 0.1-1.0 Hz and try it again.</div><div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 19, 2014 at 9:59 AM, Friedman Doron <span dir="ltr">&lt;<a href="mailto:doronf@idc.ac.il" target="_blank">doronf@idc.ac.il</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





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<p class="MsoNormal"><span style="color:#1f497d">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">The bottom figure shows what we get with the default spectopo – this is what seems to be clean EEG with approx. 80 second duration from 64 electrode data. The code is:
<u></u><u></u></span></p>
<p class="MsoNormal">figure; pop_spectopo(EEG, 1, [0  80000], &#39;EEG&#39; , &#39;freqrange&#39;,[2 60],&#39;electrodes&#39;,&#39;off&#39;)<span style="color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">perhaps this is line noise or something – if we run a filter the noise is gone.  But what concerns me is that if we use if we use some other parameters we can
 get rid of it, without any filter, e.g, the top figure is generated by:<u></u><u></u></span></p>
<p class="MsoNormal">figure; pop_spectopo(EEG, 1, [0  80000], &#39;EEG&#39; , &#39;freqrange&#39;,[2 60],&#39;electrodes&#39;,&#39;off&#39;,&#39;winsize&#39;, 1024, &#39;nfft&#39;, 1024);<span style="color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">so - we would be happy to know what are the recommended parameters for spectopo.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Link to figures:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><a href="https://www.dropbox.com/s/xdj3nehwyegu9u0/fig.png?dl=0" target="_blank">https://www.dropbox.com/s/xdj3nehwyegu9u0/fig.png?dl=0</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thx!<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></p><span class="HOEnZb"><font color="#888888">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>-<span style="font:7.0pt &quot;Times New Roman&quot;">         
</span></span></span><u></u><span dir="LTR"></span><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Doron<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u> <u></u></span></p>
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