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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear Marion,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It sounds it might indeed be something as simple as a typo. Could you paste the part of your script – from baseline removal to plotting (where you don’t see a difference) - so we can take a look?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Cheers,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Stephen<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> fieldtrip <fieldtrip-bounces@science.ru.nl> <b>On Behalf Of </b>Marion Vincent<br><b>Sent:</b> Thursday, January 17, 2019 10:37 AM<br><b>To:</b> fieldtrip@science.ru.nl<br><b>Subject:</b> [FieldTrip] Baseline removal errors in trials preprocessing<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=FR>Dear FIeldtrip users, <o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I’m new in using Fieldtrip for EEG processing and I’ve encountred some issues while removing the Baseline of my trials. <o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I’m working on EEG signals recorded with the BioSemi system. My pre-processing method is : <o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=FR><span style='mso-list:Ignore'>(1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=FR>Re-referecing the channels (necessary with BioSemi)<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=FR><span style='mso-list:Ignore'>(2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=FR>Trial definition<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=FR><span style='mso-list:Ignore'>(3)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=FR>Baseline removal<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I’ve read on the documentation that ft_preprocessing xcan have several cfg parameter for the Baseline removal :<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>% cfg.demean = 'yes';%'no' or 'yes', whether to apply baseline correction (default = 'no')<o:p></o:p></span></p><p class=MsoNormal><span lang=FR>% cfg.baselinewindow = 'all';%[begin end] ;%in seconds, the default is the complete trial (default = 'all')<o:p></o:p></span></p><p class=MsoNormal><span lang=FR>% cfg.detrend = 'no'; %'no' or 'yes', remove linear trend from the data (done per trial) (default = 'no')<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I wanted to remove a Baseline defined as the average of a given window preceeding my stimulus onset. <o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I tried to use : cfg.baselinewindow = [-0.5 0 ]; cfg.baselinewindow = [0 0.1] or the default window .<o:p></o:p></span></p><p class=MsoNormal><span lang=FR>But the problem is that I always have the same result, no matter the window I use : the first point of my trial is put to zero and substracted to all my trial. <o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>I’m sure I’m doing something wrong (and that the answer is very simple), but I can’t manage to understand what is the issue.<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>Do you have any advice ?<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal><span lang=FR>Thanks ! <o:p></o:p></span></p><p class=MsoNormal><span lang=FR>Marion<o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><b><span lang=FR style='color:#2F5597'>Marion VINCENT</span></b><span lang=FR style='color:black'><br>Eng., PhD , CNRS Research Engineer<br><br></span><span lang=FR><o:p></o:p></span></p><p class=MsoNormal><span lang=FR><o:p> </o:p></span></p></div></body></html>