<div dir="ltr">Dear Maximilien,<div><br></div><div>You should specify the filter parameters in the cfg:</div><div><br></div><div><pre style="padding:0.5em;margin-top:0px;margin-bottom:1em;font-size:12px;border:1px dashed rgb(204,204,204);color:rgb(0,0,0);overflow:hidden;font-family:consolas,"andale mono",menlo,monaco,monospace;background-color:rgb(247,249,250);white-space:pre-wrap;width:640px;text-align:justify"> cfg.artfctdef.eog.bpfilter = 'yes'
cfg.artfctdef.eog.bpfilttype = 'but';% or any other filter type you want to use, see help ft_preprocessing for more details
cfg.artfctdef.eog.bpfreq = [1 15]
cfg.artfctdef.eog.bpfiltord = 4; % goes hand-by-hand with the filter type; see <br></pre></div><div><br></div><div>Take a look to the fft_artifact_eog.m documentation. To know more about filtering you might want to take a look here:</div><div><a href="http://www.fieldtriptoolbox.org/example/determine_the_filter_characteristics">http://www.fieldtriptoolbox.org/example/determine_the_filter_characteristics</a><br></div><div><br></div><div>Best,</div><div><br></div><div>Diego</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 26 October 2016 at 10:42, Maximilien Chaumon <span dir="ltr"><<a href="mailto:maximilien.chaumon@gmail.com" target="_blank">maximilien.chaumon@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear all,<div>when attempting to detect blinks automatically on a continuous recording without EOGs, I use a few frontal sensors and ft_artifact_eog as follows:</div><div><font face="monospace"><br></font></div><div><div><font face="monospace"> cfg = [];</font></div><div><font face="monospace"> cfg.dataset = fullfile(rootdir,f{iD});</font></div><div><font face="monospace"> cfg.layout = 'neuromag306mag.lay';</font></div><div><font face="monospace"> cfg.trialdef.eventtype = 'STI101';</font></div><div><font face="monospace"> cfg.trialdef.eventvalue = {255};</font></div><div><font face="monospace"> cfg = ft_definetrial(cfg);</font></div><div><font face="monospace"> </font></div><div><font face="monospace"> cfg.trl = [cfg.trl(1,1) cfg.trl(end,2) 0];</font></div><div><span style="font-family:monospace"> cfg.channel = 'megmag'; </span><br></div><div><font face="monospace"> cfg.continuous = 'yes';</font></div><div><span style="font-family:monospace"> data = ft_preprocessing(cfg);</span><br></div><div><span style="font-family:monospace"><br></span></div><span style="font-family:monospace"><br></span></div><div><div><font face="monospace"> cfg.artfctdef.eog = [];</font></div><div><font face="monospace"> cfg.artfctdef.eog.channel = eogchans;</font></div><div><font face="monospace"> cfg.artfctdef.eog.trlpadding = 0;</font></div><div><font face="monospace"> cfg.artfctdef.eog.interactive = 'yes';</font></div><div><font face="monospace"> </font></div><div><font face="monospace"> [cfg, artifact{iC,iD}] = ft_artifact_eog(cfg,data);</font></div><div style="font-family:monospace"><br></div></div><div>This opens an interactive window in which the EOG signal is not BPfiltered, and contains in particular slow drifts that make the threshold detection pretty inefficient. I'm surprised because cfg.artfctdef is supposed to bpfilter 1-15Hz the data, isn't it?</div><div><br></div><div>Is this normal?</div><div>Thanks,</div><div>Max</div><div><br></div><div><font face="monospace"><br></font></div><div><br></div></div>
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