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</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear fellow FieldTrippers,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>For proper artifact removal, I would like to compare the (temporal) correspondence between the ICA components of my (CTF MEG275) data and the artifacts that I semi-automatically identified beforehand (eye blinks, saccades, muscle tension). ft_databrowser in principle allows me to show this, but I run into some problems that I think have to do with data resampling. The code I use is:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>% iii. plot the components for visual inspection and select bad components<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>cfg = [];<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>cfg.component = [1:10]; % components to be plotted<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>cfg.layout = 'CTF275.lay'; % specify the layout file that should be used for plotting<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>% add preveiously manually defined eog and muscle artifacts, to compare with components <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>load artifact_eog_all<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>load artifact_muscle_all <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>cfg.artfctdef.eog.artifact=art_eog_all;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>cfg.artfctdef.muscle.artifact=art_muscle_all;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>% visual inspection<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>ft_databrowser(cfg, comp150);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The problem I have is that the artifacts are not shown at the right moments in time during the experiment. The data that are ICA-ed are resampled from 1200->150Hz, but I do not know how I can ‘resample’ the artifact definitions, since they are defined in samples, not in time. If I manually resample (by dividing the values by a factor 8), they are still not displayed at the correct moments in time.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have the impression that convert_event (fieltrip/private) could be of use here, but I cannot figure it out correctly.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Best,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Stan<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>--<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Stan van Pelt, PhD<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Donders Institute for Brain, Cognition and Behaviour<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Radboud University<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Montessorilaan 3, B.01.34<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>6525 HR Nijmegen, the Netherlands<o:p></o:p></span></p><p class=MsoNormal>tel: +31 24 3616288 <o:p></o:p></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>