<div dir="ltr"><div>Dear Iman,</div><div><br></div>There are two types of bad channels: crazy (10000 uV) or dead (0 uV). After highpass & lowpass filtering, you can simply calculate standard deviation across time for each channel (if the channel is more or less stationary).<div>
<br></div><div>If I have >100 channels I would not be afraid of false negative and discard channels generously.</div><div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-03-06 14:03 GMT-08:00 Iman M.Rezazadeh <span dir="ltr"><<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>So what is your strategy to reject channels?</div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">
Sent from my Verizon Wireless 4G LTE smartphone</div></div><div><div class="h5"><br><br><br><br>-------- Original message --------<br>From: Makoto Miyakoshi <u></u> <br>Date:03/05/2014 11:41 (GMT-08:00) <br>To: "Iman M.Rezazadeh" <u></u> <br>
Cc: EEGLAB List <u></u> <br>Subject: Re: selecting bad channel <br><br><div dir="ltr">I never use EEGLAB's automatic channel rejection because it usually rejects more than I need to.<div><br></div><div>Makoto</div></div>
<div class="gmail_extra"><br><br><div class="gmail_quote">2014-03-05 11:31 GMT-08:00 Iman M.Rezazadeh <span dir="ltr"><<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">By looking at data …in my point of view sometimes stats cannot show if a channel is good or bad<u></u><u></u></span></p>
<p class="MsoNormal"><a name="1449978a5893b1f2_14493bacf09fb611__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></a></p><p class="MsoNormal">
<b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Makoto Miyakoshi [mailto:<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>] <br>
<b>Sent:</b> Wednesday, March 5, 2014 10:12 AM<br><b>To:</b> Iman M.Rezazadeh<br><b>Cc:</b> EEGLAB List<br><b>Subject:</b> Re: selecting bad channel<u></u><u></u></span></p><div><div><p class="MsoNormal"><u></u> <u></u></p>
<div><p class="MsoNormal">Dear Iman,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Select data -> select by channels. I don't know though how you judge them 'bad'.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Makoto<u></u><u></u></p></div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p><div><p class="MsoNormal">2014-03-05 1:08 GMT-08:00 Iman M.Rezazadeh <<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>>:<u></u><u></u></p>
<blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal">Hi EEGLABERS,<u></u><u></u></p><p class="MsoNormal">Could you please let me know if there is anyway on GUI to select a subset of bad channels (not all) after doing ‘automatic channel rejection’ ? <u></u><u></u></p>
<p class="MsoNormal">CIAO <u></u><u></u></p><p class="MsoNormal">Iman<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"><b>-------------------------------------------------------------</b><u></u><u></u></p>
<p class="MsoNormal"><b>Iman M.Rezazadeh, Ph.D</b><u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Postdoctorocal Research Fellow<u></u><u></u></p><p class="MsoNormal">Semel Intitute, UCLA , Los Angeles<u></u><u></u></p>
<p class="MsoNormal">& Center for Mind and Brain, UC DAVIS, Davis<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Mob.: <a href="tel:310-490-1808" target="_blank">310-490-1808</a><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p></div></div></blockquote></div><p class="MsoNormal"><br><br clear="all"><u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><p class="MsoNormal">-- <u></u><u></u></p>
<div><p class="MsoNormal">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<u></u><u></u></p></div></div></div></div></div></div></blockquote>
</div><br><br clear="all"><div><br></div>-- <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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</div></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br>
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