<p><span style="padding: 3px 10px; border-radius: 5px; color: #ffffff; font-weight: bold; display: inline-block; background-color: #ff0000;"> External Email - Use Caution </span></p><p></p><div dir="ltr">Hi Denis, <div>1. If the raw data is filtered before the ICA, should one filter averaged responses again before source modelling?</div><div>2. In case of the situation I described above, is it possible to use NCM calculated for unfiltered NCM-epochs, or it is totally wrong?</div><div>Thank you again!</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 26, 2020 at 5:19 PM Denis A. Engemann <<a href="mailto:denis-alexander.engemann@inria.fr">denis-alexander.engemann@inria.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> External Email - Use Caution <br>
<br>
Hi Laura,<br>
<br>
To me the safest thing is bandpass filtering at raw stage, e.g., prior to ICA.<br>
Then you keep processing identical for data and noise covariance and just use the baseline segments from the otherwise identically processed epochs.<br>
Have you tried that?<br>
<br>
Denis<br>
<br>
> On Mar 26, 2020, at 4:11 PM, Laura Munkki <<a href="mailto:lauramunkki@gmail.com" target="_blank">lauramunkki@gmail.com</a>> wrote:<br>
> <br>
> External Email - Use Caution <br>
> <br>
> <br>
> Hi Denis,<br>
> Thank you very much for your reply.<br>
> I did maxfiltering and ICA for the raw data, so these steps are applied for both types of epochs, evoked responses and NCM. But I did not use any band-pass filters before averaging. I filtered only averaged ERPs just before source reconstruction. So, if I filter NCM epochs, it will not be the same. My question is: when should I apply a band-pass filter for the NCM? I tried to apply it to the NCM-epochs file, but the result was distorted: instead of sources around auditory cortex I've got several sources in unpredictable locations. But when I tried to use NCM calculated for unfiltered NCM-epochs, the sources were around auditory cortex and had much stronger amplitude.<br>
> Looking forward for your answer,<br>
> Thank you very much for helping me,<br>
> Laura.<br>
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