<div><span><span style="font-family:"Times New Roman","serif";font-size:12pt">Dear All,<br>
<br>
My group is working on some eeg data recorded simultaneously during fMRI<br>
scanning and it has been contaminated with helium pump (HP) artifacts. <br>
The HP noise in our data has a significant peak around 35 Hz in power<br>
spectrum, however, its harmonics have also contaminated the eeg signal<br>
in other frequencies. Anyone know how to remove the HP artifacts from EEG effectively?</span></span></div><div><span><span style="font-family:"Times New Roman","serif";font-size:12pt"></span></span> </div>
<div><span><span style="font-family:"Times New Roman","serif";font-size:12pt">We have tried to remove this noise using ICA, however, most of ICs seem to contain HP<br>
harmonics pattern (based on visual inspection of ICs power spectrum). Therefore, I have a concern that removing all of these ICs (with peak around 35 Hz) may lose other informative part of data.</span></span></div><span><span style="font-family:"Times New Roman","serif";font-size:12pt"></span></span><span><span style="font-family:"Times New Roman","serif";font-size:12pt"><div>
</div></span><div></div></span><div><span><span style="font-family:"Times New Roman","serif";font-size:12pt">Appreciate any advice, comment or suggestions.<br>
<br>
Thank you and best regards,</span></span></div><div><span><span style="font-family:"Times New Roman","serif";font-size:12pt">Helen Juan Zhou</span></span></div><p><span><span style="font-family:"Times New Roman","serif";font-size:12pt"><span style="color:rgb(95,73,122);font-family:"Calibri","sans-serif";font-size:10pt"><strong>Helen Juan Zhou,  Ph.D.<br>

</strong></span><span style="color:rgb(95,73,122);font-family:"Calibri","sans-serif";font-size:10pt">Assistant Professor/Principal Investigator<br>
Neuroscience and Behavioral Disorders Program<br>
Duke-NUS Graduate Medical School, Singapore<br>
8 College Road, #06-33, Singapore 169857   Tel: (65) 66012392
 Fax: (65) 62218685<br>
Email: <a href="https://mail.google.com/mail/u/0/html/compose/static_files/helen.zhou@duke-nus.edu.sg"><font color="#0000ff">helen.zhou@duke-nus.edu.sg</font></a>
           Website:<a href="https://sites.google.com/site/mneuroimaginglab/"><font color="#0000ff">https://sites.google.com/site/mneuroimaginglab/</font></a>
<<a href="https://sites.google.com/site/mneuroimaginglab/"><font color="#0000ff">https://sites.google.com/site/mneuroimaginglab/</font></a>>
<br style>
<br style>
</span></span></span></p><div><br style>
<br style>
</div>