# Highpass and lowpass filters did not work **URL:** \ **Category:** Mailing List Archive (read-only)\ **Tags:** list-archive\ **Created:** [April 17, 2019, 5:13pm UTC](https://mne.discourse.group/t/highpass-and-lowpass-filters-did-not-work/1820 "2019-04-17T17:13:32Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [April 17, 2019, 5:13pm UTC](https://mne.discourse.group/t/highpass-and-lowpass-filters-did-not-work/1820/1 "2019-04-17T17:13:32Z")
External Email - Use Caution Hi all, In my preprocessing step, I have used the highpass filter of 0.1Hz and lowpass filter of 100.0 Hz in addition to the notch\_filter of 60Hz. It also shows up in my epochs.info. However, after plotting "epochs.psd ". I still have higher frequencies and line noises. I have attached the picture of my epochs.info and epochs.psd plot in addition to the ica component of the epoched data. I'd be thankful if anyone could let me know the possible reason for this issue. Thanks, -Mary [image: psd\_plot.png] [image: ica\_comp.png] -------------- next part -------------- An HTML attachment was scrubbed... URL: [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190417/73141480/attachment-0001.html](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190417/73141480/attachment-0001.html) -------------- next part -------------- A non-text attachment was scrubbed... Name: psd\_plot.png Type: image/png Size: 399795 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190417/73141480/attachment-0004.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190417/73141480/attachment-0004.png) -------------- next part -------------- A non-text attachment was scrubbed... Name: ica\_comp.png Type: image/png Size: 99371 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190417/73141480/attachment-0005.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190417/73141480/attachment-0005.png) -------------- next part -------------- A non-text attachment was scrubbed... Name: psd\_plot.png Type: image/png Size: 399795 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190417/73141480/attachment-0006.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190417/73141480/attachment-0006.png) -------------- next part -------------- A non-text attachment was scrubbed... Name: ica\_comp.png Type: image/png Size: 99371 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190417/73141480/attachment-0007.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190417/73141480/attachment-0007.png) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [April 18, 2019, 7:57am UTC](https://mne.discourse.group/t/highpass-and-lowpass-filters-did-not-work/1820/2 "2019-04-18T07:57:53Z")
External Email - Use Caution you should check that you passed to Epochs the right raw object (check copies etc.) I don't see how what you report can happen. Alex >         External Email - Use Caution > > Hi all, > > In my preprocessing step, I have used the highpass filter of 0.1Hz and > lowpass filter of 100.0 Hz in addition to the notch\_filter of 60Hz. It also > shows up in my epochs.info. However, after plotting "epochs.psd ". I > still have higher frequencies and line noises. I have attached the picture > of my epochs.info and epochs.psd plot in addition to the ica component of > the epoched data. I'd be thankful if anyone could let me know the possible > reason for this issue. > > Thanks, > -Mary > > [image: psd\_plot.png] > > [image: ica\_comp.png] > > \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ > Mne\_analysis mailing list > Mne\_analysis at nmr.mgh.harvard.edu > [Mne\_analysis Info Page](https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis) -------------- next part -------------- An HTML attachment was scrubbed... URL: [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190418/e5f4259c/attachment-0001.html](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190418/e5f4259c/attachment-0001.html) -------------- next part -------------- A non-text attachment was scrubbed... Name: psd\_plot.png Type: image/png Size: 399795 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190418/e5f4259c/attachment-0002.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190418/e5f4259c/attachment-0002.png) -------------- next part -------------- A non-text attachment was scrubbed... Name: ica\_comp.png Type: image/png Size: 99371 bytes Desc: not available Url : [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190418/e5f4259c/attachment-0003.png](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190418/e5f4259c/attachment-0003.png)