<div dir="ltr">Dear Philippa,<div><br></div><div>People have different 'preferences' when it comes to filtering. Hence their recommendation do differ, which could be confusing. However, I've never heard of a paper rejected by improper filtering. If you follow one of the standard applications in the literature, you'll be fine. I know this sounds stupid but this is the truth. By the way I recommend EEGLAB's 'Basic FIR filter (new, default)' with low-end '1', which applies 0.5-Hz cutoff (-6dB) filter. Some say this is aggressive and 'distorts ERP', but there are several trade-offs which they do not emphasize. </div><div><br></div><div>Here is a summary from my past communication with Andreas Widmann for your info.</div><div><a href="http://sccn.ucsd.edu/wiki/Firfilt_FAQ">http://sccn.ucsd.edu/wiki/Firfilt_FAQ</a><br></div><div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 17, 2015 at 7:09 AM, Philippa Howsley <span dir="ltr"><<a href="mailto:psfhowsley1@sheffield.ac.uk" target="_blank">psfhowsley1@sheffield.ac.uk</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"><span style="font-family:HelveticaNeue">Dear all,</span><br style="font-family:HelveticaNeue"><div style="font-family:HelveticaNeue"><br></div><div style="font-family:HelveticaNeue">We have collected EEG data using the Biosemi Active Two system and are trying to determine the best way to remove the DC offset. We’re looking at ERPs so don’t want to high-pass filter our data too aggressively.</div><div style="font-family:HelveticaNeue"><br></div><div style="font-family:HelveticaNeue">After importing the .bdf files into EEGLAB we are considering filtering the data using the ERPLAB IIR Butterworth filter and ‘remove mean value (DC bias) before filtering’ option before continuing to analyse the data in EEGLAB. Are there any reasons why this wouldn’t be possible or advisable?</div><div style="font-family:HelveticaNeue"><br></div><div style="font-family:HelveticaNeue">Any advice would be greatly appreciated.</div><div style="font-family:HelveticaNeue"><br></div><div style="font-family:HelveticaNeue">Many thanks in advance,</div><div style="font-family:HelveticaNeue">Philippa</div><br><div>
<div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word">--</div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><b>Philippa Howsley</b><br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word">Postgraduate Research Student<br>Department of Psychology<br>The University of Sheffield<br>Sheffield, S10 2TN<br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><a href="http://www.levita-lab.group.shef.ac.uk" target="_blank">www.levita-lab.group.shef.ac.uk</a></div></div></div></div></div></div>
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