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<p>Dear all,</p>
<p>we are processing EEG data with Fieldtrip and we use
ft_databrowser to visualize our data (typically, for example, to
review data and check if they have been well corrected by ICA, or
to check if they are remaining artefacts after some correction).
These are continuous or epoched raw or ICA-corrected EEG data
recorded on multiple (128) channels.<br>
</p>
<p>I have a problem which is that I find it very hard to know what
is the scale of data visualization. For example: ylim = [-50, 50]
seems to correspond to some arbitrary unit which does not
represent the same "height" on screen depending on how many
channels I am displaying; hence fixing ylim does not help. I have
not found the way to know to how much height or "cm" my y scale
corresponds. <br>
</p>
<p>Can you help me with this? <br>
</p>
<p>thank you very much in advance, <br>
</p>
<p>best</p>
<p>nathalie george<br>
</p>
<div class="moz-cite-prefix">Le 18/03/2021 à 10:32, H L a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAEizvpc3GZqLDF72unpZQTeV=sAD5RDHTdcLwKPGRqB1auym6A@mail.gmail.com">
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<div>Dear all, <br>
</div>
<div><br>
</div>
<div>I'm a beginner in the fieldtrip use.</div>
<div>I have a dataset of 6 different subjects. Before analyzing
this dataset, of course I wanted to reject any artifact. I did
it through two way:</div>
<div>1) first I used the ft_databrowser() function to do it
manually as follows:</div>
<div>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>> for i =
1 :numel(dataEEG)<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>> cfg = []<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>>
cfg.channel = ‘all’<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)">>> cfg.viewmode =
‘butterfly’<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)">>> artifact =
ft_databrowser(cfg, dataEEG(i))<span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)">>> end</span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">So
I selected the crunches of the data letting me think that it
could be artifacts</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">2)
second, I wanted to do it using the ft_rejectvisual()
function with the 'summary' method option</p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>> for i =
1 :numel(dataEEG)<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>> cfg = []<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)" lang="FR">>>
cfg.method = ‘summary’<span></span></span></p>
<p class="MsoNormal"
style="margin:0in;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)">>> artifactSummary =
ft_databrowser(cfg, dataEEG(i))<span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)">>> end</span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Now
I would like to compare the both dataset without artifact to
see if what I rejected with ft_databrowser() and
ft_rejectvisual() functions are comparable. <b>However, I
really do not know how to print the plots of the new
datasets without artifacts generated by both method to
compare it visually. Would you know how to do it?</b></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br>
</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Thank
you so much for your kind help!</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br>
</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Best
regards!</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br>
</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Hugues<br>
</p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)"><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in
8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(68,114,196)"><span></span></span></p>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
--
Nathalie GEORGE, DR CNRS
Equipe Experimental Neurosurgery
Directrice Scientifique du Centre MEG-EEG
Institut du Cerveau et de la Moelle Epiniere (ICM)
UMR 7225 / UMR_S 1127, Sorbonne Université / CNRS / INSERM
GHU Pitié-Salpetriere
47, Bd de l'Hopital
F-75651 PARIS Cedex 13
tel: +33(0)1 57 27 43 79
fax: +33(0)1 57 27 47 93
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:nathalie.george@upmc.fr">nathalie.george@upmc.fr</a>
<a class="moz-txt-link-freetext" href="http://icm-institute.org/fr/">http://icm-institute.org/fr/</a>
***********
Si tout ici-bas était excellent, il n'y aurait rien d'excellent.</pre>
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