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--></style></head><body lang=FR><div class=WordSection1><p class=MsoNormal>Dear FIeldtrip users, </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m new in using Fieldtrip for EEG processing and I’ve encountred some issues while removing the Baseline of my trials. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m working on EEG signals recorded with the BioSemi system. My pre-processing method is : </p><ol style='margin-top:0cm' start=1 type=1><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'>Re-referecing the channels (necessary with BioSemi)</li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'>Trial definition</li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'>Baseline removal</li></ol><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’ve read on the documentation that ft_preprocessing xcan have several cfg parameter for the Baseline removal :</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>% cfg.demean = 'yes';%'no' or 'yes', whether to apply baseline correction (default = 'no')</p><p class=MsoNormal>% cfg.baselinewindow = 'all';%[begin end] ;%in seconds, the default is the complete trial (default = 'all')</p><p class=MsoNormal>% cfg.detrend = 'no'; %'no' or 'yes', remove linear trend from the data (done per trial) (default = 'no')</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I wanted to remove a Baseline defined as the average of a given window preceeding my stimulus onset. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I tried to use : cfg.baselinewindow = [-0.5 0 ]; cfg.baselinewindow = [0 0.1] or the default window .</p><p class=MsoNormal>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. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Do you have any advice ?</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks ! </p><p class=MsoNormal>Marion</p><p class=MsoNormal> </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='color:#2F5597'>Marion VINCENT</span></b><span style='color:black'><br>Eng., PhD , CNRS Research Engineer<br><br><br></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>