[Eeglablist] Persistent 20 Hz Harmonic Line Noise in EEG Data

Mon May 18 21:47:14 PDT 2026

Hi Maeghal,

Let me guess your EPI scan parameters: TR=2, volume slices = 40. This will
give you a 20 Hz gradient switching artifact. I'm sure Stefan Debener will
agree with me.

Makoto

On Mon, May 18, 2026 at 1:44 PM Maeghal Jain via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi Eric,
>
> Thank you very much for the detailed and helpful reply.
>
> Over the weekend I sat and wrote some version of this for my dataset (
>
> https://urldefense.com/v3/__https://github.com/csea-lab/csea-lab/blob/refs*2Fheads*2Fmaster/Libas*2FLB3*2FLB3_prepro_eegfmri_1.m__;JSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaFh6i6OJQ$
> )
> and now the PSD and topomap both look a bit better.
>
> PSD:
> https://urldefense.com/v3/__https://ibb.co/kg9h9s8P__;!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGVkjJ2IQ$
> Topomap:
> https://urldefense.com/v3/__https://ibb.co/WvdW3xFB__;!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGEiH6G3g$
>
> On average template subtraction: I assume this is not\ the same as average
> re-referencing (which I tried in multiple implementations with no
> improvement on the 20 Hz harmonic). Could you clarify or point me to the
> exact code/steps for average (or moving-window) template subtraction? I’d
> be very grateful for any example code snippet.
>
> Recommended papers: Could you list one or two papers you find most relevant
> or useful for this kind of preprocessing?
>
> I would genuinely appreciate the opportunity to discuss this further. I’ll
> send you a direct message/calendar invite shortly to book a short call at a
> convenient time for you.
>
> Thank you again for your time and expertise!
>
> Best regards,
> Maeghal Jain
> BISE Lab
>
> On Fri, May 15, 2026, 1:33 AM Rawls, Eric <rawlse at uncw.edu> wrote:
>
> > Hi Maeghal,
> >
> > That changes things substantially. There are very strong noise sources in
> > simultaneous EEG-fMRI that cannot be dealt with using standard methods.
> >
> > First and most important - have you processed the data to remove gradient
> > artifacts? There are a number of ways to this, from average template
> > subtraction (simplest), to moving window template subtraction, to
> > augmentation with principal components of the template (this is
> implemented
> > in the EEGLAB plugin fMRIB2.1 which I have found high performance with).
> > Note that ICA is entirely unsuitable for gradient artifact removal.
> >
> > Second, you will find your data contaminated with ballistocardiographic
> > artifact, although that is not likely to cause your 20Hz contamination.
> You
> > will need to detect heartbeats from a (hopefully dedicated) ECG channel
> to
> > remove these artifacts which mostly occur at low frequencies and are
> > magnitudes larger than EEG. This is also implemented in fMRIB2.1 for
> EEGLAB.
> >
> > Finally, note that you will encounter additional noise from the helium
> > pump and other sources. These sources of noise are not easy to remove
> from
> > the EEG, and while the pump can be turned off, we found that this caused
> > instabilities in our magnet's temperature so instead we focused analysis
> on
> > frequencies outside of the helium pump's native frequency.
> >
> > On a side note, I have worked with simultaneous EEG-fMRI data for several
> > years now, and would be happy to discuss artifact removal strategies and
> > aoftware solutions for these methods. Please let me know.
> >
> > Best, E
> >
> >
> > Eric Rawls, Ph.D. (he/him/his)
> >
> > Assistant Professor | Department of Psychology
> > Director | Brain, Data, and Causality (BDC) Lab
> > College of Science and Engineering
> > University of North Carolina Wilmington
> >
> > Adjunct Assistant Professor | Department of Psychiatry and Behavioral
> > Sciences
> > College of Medicine
> > University of Minnesota Twin Cities
> >
> > The University of North Carolina Wilmington rests on historic lands of
> the
> > Cape Fear Indians and the Waccamaw Siouan people.
> >
> > The University of Minnesota rests on historic lands of the Dakota people.
> >
> > NOTICE: Emails sent and received in the course of university business are
> > subject to the North Carolina Public Records Act (N.C.G.S. §132-1 et
> seq.)
> > and may be released to the public unless an exception applies.
> >
> >
> > <
> https://urldefense.com/v3/__https://outlook.office.com/bookwithme/user/82c92b80a22d45b0a310ddc81d7cf83c@uncw.edu?anonymous&ep=signature&ismsaljsauthenabled__;!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaHD5bVZjA$
> >
> > Book time to meet with me
> > <
> https://urldefense.com/v3/__https://outlook.office.com/bookwithme/user/82c92b80a22d45b0a310ddc81d7cf83c@uncw.edu?anonymous&ep=signature&ismsaljsauthenabled__;!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaHD5bVZjA$
> >
> > ------------------------------
> > *From:* eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of
> > Maeghal Jain via eeglablist <eeglablist at sccn.ucsd.edu>
> > *Sent:* Thursday, May 14, 2026 10:36 AM
> > *To:* Cedric Cannard <ccannard at protonmail.com>
> > *Cc:* EEGLAB List <eeglablist at sccn.ucsd.edu>
> > *Subject:* Re: [Eeglablist] Persistent 20 Hz Harmonic Line Noise in EEG
> > Data
> >
> > [This email originated from outside of UNCW]
> >
> > Hi Cedric,
> >
> > Yes, this data is EEG-fMRI recorded simultaneously. That's probably why
> > this must be happening.
> >
> > Should I remove it with ICA or I tried Zapline as well. ICA makes sense
> but
> > am just not sure how to pick out this one component that causes it all.
> >
> > Thank you for raising this point.
> >
> > Maeghal Jain
> >
> > On Thu, May 14, 2026 at 9:22 AM Cedric Cannard via eeglablist <
> > eeglablist at sccn.ucsd.edu> wrote:
> >
> > > I would follow all these great suggestions.
> > > One thing that hasn’t been asked unless I missed it. Is your system
> > > recording other modalities simultaneously (GSR, PPG, fNIRS, etc.)?
> > >
> > > If so, many PPG modules use PWM-driven LEDs pulsing at or near 20 Hz,
> and
> > > electrical crosstalk through shared grounding or circuitry can inject
> > this
> > > directly into the EEG signal.
> > >
> > > GSR/EDA devices typically use low-frequency AC excitation, so
> > > high-frequency interference is less common, but I’ve seen it with the
> > > Biosemi system at 16 Hz.
> > >
> > > fNIRS modulates its light sources at specific frequencies (sometimes
> > > 20-100 Hz) for lock-in detection. If the driving electronics share a
> > power
> > > supply or chassis with the EEG amplifier, that modulation frequency can
> > > appear as a narrow spectral peak.
> > >
> > > If that’s the case, the cleanest diagnostic is to record EEG with each
> > > co-sensor powered on vs. off and check whether the artifact peak
> appears
> > > only when a given sensor is active.
> > >
> > >
> > > Cedric
> > >
> > > Sent from Proton Mail for iOS.
> > >
> > > -------- Original Message --------
> > > On Tuesday, 05/12/26 at 17:06 Rawls, Eric via eeglablist <
> > > eeglablist at sccn.ucsd.edu> wrote:
> > > Is the 20Hz interference visible in the power spectrum of the raw data
> or
> > > does it only show up after some preprocessing? I have seen something
> like
> > > this occur with specific downsampling/filtering orders in older
> versions
> > of
> > > EEGLAB but I do not recall the exact order-of-operations required to
> > > recreate it.
> > >
> > > Best, E
> > >
> > >
> > > Eric Rawls, Ph.D. (he/him/his)
> > >
> > > Assistant Professor | Department of Psychology
> > > Director | Brain, Data, and Causality (BDC) Lab
> > > College of Science and Engineering
> > > University of North Carolina Wilmington
> > >
> > > Adjunct Assistant Professor | Department of Psychiatry and Behavioral
> > > Sciences
> > > College of Medicine
> > > University of Minnesota Twin Cities
> > >
> > > Land Acknowledgment: I acknowledge that UNCW is located on the
> ancestral
> > > and traditional homelands of Indigenous peoples, including the Waccamaw
> > > Siouan and other tribes with enduring ties to this region such as the
> > > Lumbee, Coharie, Haliwa-Saponi, and Cherokee. I honor the ongoing
> > presence,
> > > history, and stewardship of Native communities and offer this
> > > acknowledgment in a spirit of respect and relationship.
> > >
> > > NOTICE: Emails sent and received in the course of university business
> are
> > > subject to the North Carolina Public Records Act (N.C.G.S. §132-1 et
> > seq.)
> > > and may be released to the public unless an exception applies.
> > >
> > > [cid:ca52e587-5639-4806-9792-0befc92fb683]<
> > >
> >
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> > <
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> >
> > > >
> > > Book time to meet with me<
> > >
> >
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> > <
> https://urldefense.com/v3/__https://outlook.office.com/bookwithme/user/82c92b80a22d45b0a310ddc81d7cf83c@uncw.edu?anonymous&ep=signature&ismsaljsauthenabled__;!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD5astO1_g$
> >
> > > >
> > > ________________________________
> > > From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of Scott
> > > Makeig via eeglablist <eeglablist at sccn.ucsd.edu>
> > > Sent: Tuesday, May 12, 2026 10:32 AM
> > > To: Евгений Машеров <emasherov at yandex.ru>
> > > Cc: eeglablist at sccn.ucsd.edu <eeglablist at sccn.ucsd.edu>
> > > Subject: Re: [Eeglablist] Persistent 20 Hz Harmonic Line Noise in EEG
> > Data
> > >
> > > [This email originated from outside of UNCW]
> > >
> > > Eugen,
> > >
> > > Yes, thanks for correcting me - I was indeed reading from the tutorial
> > > example(@ 25 Hz)  rather than the actual data (@ 20 Hz) ... I believe
> you
> > > are correct that some nearby electronic source must have been the
> cause.
> > I
> > > believe it would be worthwhile to apply an initial ICA to see whether
> its
> > > scalp projection (scalp map) is stable enough to be largely (or
> totally)
> > > accounted by a single independent component, which then could be
> removed
> > > neatly from the data -- or ignored in further analysis of the (brain)
> > > independent source distribution.
> > >
> > > Scott
> > >
> > > On Mon, May 11, 2026 at 3:19 PM Евгений Машеров <emasherov at yandex.ru>
> > > wrote:
> > >
> > > > If you're referring to this spectrum,
> > > >
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fibb.co*2F5WbNqYCW__*3B!!Mih3wA!CULZcfFkieH_bUE1w0wwnlMTADY94DKwrrOAJL4cnmw9hjrWFGypYhZLJUl1ZVoht5v4sXALi-8AvrBSXjma*24*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933252982464*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3DsYXFOzhWyOH2ACDQyJCVC3IVpqjKiAJvcXasU*2F9nytw*3D*26reserved*3D0__*3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD6kn9dfOw*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887892886*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=*2BVQn*2BUKddwutZUsZsa*2B3uyEpOAX25l9cGdtztz0TTtM*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKioqKioqKiUlKioqKioqKioqKioqKioqKiUlKiolJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaH2cSz-qg$
> > <
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> >
> > > <
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fibb.co*2F5WbNqYCW__*3B!!Mih3wA!CULZcfFkieH_bUE1w0wwnlMTADY94DKwrrOAJL4cnmw9hjrWFGypYhZLJUl1ZVoht5v4sXALi-8AvrBSXjma*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887915006*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=8OEcXVw7nQyuetqwOTGQNdM3lFusSVuRpFLOeC1gw*2BU*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaEBQrg20A$
> > <
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> >
> > > >
> > > > I see a peak at 20 Hz (around 30 dB), 40 Hz (around 40 dB), and 60 Hz
> > > > (around 30 dB). Possible sources include MRI (pulse frequency) or
> > > > physiotherapy equipment. It could also be some industrial equipment.
> In
> > > one
> > > > case, the interference was from a nearby airport's radar.
> > > >
> > > > > The plots here clearly show the noise is at 25 Hz and its harmonics
> > ...
> > > > >
> > > > > On Sat, May 9, 2026 at 11:08 AM Евгений Машеров via eeglablist <
> > > > eeglablist at sccn.ucsd.edu> wrote:
> > > > >
> > > > >> This isn't power line interference. It would be 50 or 60 Hz, and
> > > > possibly harmonics at multiples of 100-150-200... or 120-180-240-...
> > > > frequencies. Subharmonics wouldn't appear. It's undoubtedly a
> technical
> > > > artifact, although I'm unsure of the source. Railways sometimes use
> > other
> > > > frequencies (16 2/3 Hz, others—20, 25, 45, and others no longer in
> > > use)—but
> > > > not 20 Hz. A television screen will show 50 (PAL/SECAM) or 60 (NTSC)
> > Hz,
> > > > computer monitors even higher, and it could be some obsolete or
> > > specialized
> > > > video equipment (with a lower frame rate). I'd assume the source in
> > your
> > > > case is medical equipment (although I can't rule out, for example, a
> > > > security alarm).
> > > > >>
> > > > >> The best course of action is to find the source of the
> interference
> > > and
> > > > turn it off. However, this isn't always possible, especially with
> > medical
> > > > equipment. A similar situation occurred with an infusion pump in the
> > > > intensive care unit: the intermittently activated drive solenoid
> > created
> > > > regular pulsed interference. A possible solution, also used to
> combat a
> > > > physiological artifact—an electrocardiographic signal interfering
> with
> > > the
> > > > EEG—is to evaluate the shape of the interference (the presence of
> > > harmonics
> > > > indicates that the shape is clearly not sinusoidal) and subtract it
> > from
> > > > the signal. To do this, narrowband filtering isolates the fundamental
> > 20
> > > Hz
> > > > harmonic, its peaks (or zero crossings) are used as a trigger for
> > > > averaging, the averaged response is calculated for each channel, and
> > then
> > > > subtracted from the signals for the individual channels. Naturally,
> > this
> > > is
> > > > a post-processing method and is not suitable for online processing.
> > > > >>
> > > > >> Your truly
> > > > >>
> > > > >> Eugen Masherov
> > > > >>
> > > > >>> Dear EEGLAB List,
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> I am currently dealing with persistent line-noise contamination
> in
> > my
> > > > EEG
> > > > >>
> > > > >>> recordings, specifically strong peaks around 20 Hz and its
> > harmonics
> > > > (40
> > > > >>
> > > > >>> Hz, 60 Hz, etc.). The contamination remains substantial even
> after
> > > > multiple
> > > > >>
> > > > >>> preprocessing attempts.
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Raw Data PSD for reference:
> > > >
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fibb.co*2F5WbNqYCW__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dCuBxHG_A*24*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253242409*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3DeIaQQjDBsZ5HLbBJlpYPu2JekmgTwMZu5OqKhVX6CsA*3D*26reserved*3D0__*3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD7L52136w*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887935575*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=OaZRSXAHx8l0rTTcnmr889ygH9jlQhJkQGzewdXSDd8*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKioqKioqKiUlKioqKioqKioqKioqKioqKiUlKiUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaFmJmv6dA$
> > <
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fibb.co*2F5WbNqYCW__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dCuBxHG_A*24&data=05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253242409*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=eIaQQjDBsZ5HLbBJlpYPu2JekmgTwMZu5OqKhVX6CsA*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD7L52136w$
> >
> > > <
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fibb.co*2F5WbNqYCW__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dCuBxHG_A*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887955514*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=JAOGdcNpjN4CyhvhUXJAvq10ZyrvUZMxkt4*2FBD3NO70*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaHsVJKGAg$
> > <
> https://urldefense.com/v3/__https://ibb.co/5WbNqYCW__;!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dCuBxHG_A$
> >
> > > >
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> I have already tried:
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> -
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Average re-referencing before notch filtering
> > > > >>
> > > > >>> -
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Average re-referencing after notch filtering
> > > > >>
> > > > >>> -
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Multiple full-rank average reference implementations, including:
> > > > >>
> > > > >>> -
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Makoto’s fullRankAveRef()
> > > > >>
> > > > >>> -
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Manual full-rank average reference using (nchan + 1) denominator
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Despite this, a large amount of the harmonic noise is still
> present
> > > in
> > > > the
> > > > >>
> > > > >>> spectra.
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> For reference, the issue looks somewhat similar to this
> discussion:
> > > > >>
> > > > >>>
> > > >
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fmne.discourse.group*2Ft*2Fline-noise-eeg*2F11817__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dB2ZPVDPg*24*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253274372*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3DFJlsgfiAAdK1fqkeYAwd1vB8OyNv5OSzHhPdOJQVKAI*3D*26reserved*3D0__*3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD4f1vGU-Q*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887974956*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=YREKXSVB*2F1cdeK1tXhUhJkse8suE524Be9hFCGgqrtU*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKioqKioqKioqJSUqKioqKioqKioqKioqKioqJSUqJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGGW4LeCg$
> > <
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fmne.discourse.group*2Ft*2Fline-noise-eeg*2F11817__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dB2ZPVDPg*24&data=05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253274372*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=FJlsgfiAAdK1fqkeYAwd1vB8OyNv5OSzHhPdOJQVKAI*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD4f1vGU-Q$
> >
> > > <
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fmne.discourse.group*2Ft*2Fline-noise-eeg*2F11817__*3B!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dB2ZPVDPg*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687887995192*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=BQNETjJf*2FjpjQQFo5R5OI2fwUjfUlRjj1n5G32aMjJc*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaEhgAX_lw$
> > <
> https://urldefense.com/v3/__https://mne.discourse.group/t/line-noise-eeg/11817__;!!Mih3wA!EfdhaFV_tpprT4Wc8_HcfK7KDVTXA0O0NPLW3Ws732nxP-TmPxHUXI_qXevcPIO8hfndJk8euI6BWbB1_dB2ZPVDPg$
> >
> > > >
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> I would greatly appreciate advice on how people in the EEGLAB
> > > community
> > > > >>
> > > > >>> typically handle this kind of persistent harmonic contamination.
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Would you recommend CleanLine, Zapline-plus, spectrum
> > interpolation,
> > > > ASR,
> > > > >>
> > > > >>> ICA-based approaches, or something else?
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Thank you very much for your help.
> > > > >>
> > > > >>>
> > > > >>
> > > > >>> Best regards,
> > > > >>
> > > > >>> Maeghal Jain
> > > > >>
> > > > >>> BISE Lab
> > > > >>
> > > > >>> _______________________________________________
> > > > >>
> > > > >>> To unsubscribe, send an empty email to
> > > > eeglablist-unsubscribe at sccn.ucsd.edu or visit
> > > >
> > >
> >
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> > <
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Fsccn.ucsd.edu*2Fmailman*2Flistinfo*2Feeglablist&data=05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253298283*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=lisqxIA*2B4OVEAiMrGK6cWHUvIUSghekFoxf6DSQHCm8*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD6inTlV8w$
> >
> > > <
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Fsccn.ucsd.edu*2Fmailman*2Flistinfo*2Feeglablist&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888037902*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=PfDaMpuE*2FrjkV*2B5Zvh8x7WXgQ6f1v8KZUjH4hjAPcf4*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGxh_EnLg$
> > >  .
> > > > >>
> > > > >> _______________________________________________
> > > > >>
> > > > >> To unsubscribe, send an empty email to
> > > > eeglablist-unsubscribe at sccn.ucsd.edu or visit
> > > >
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttps*3A*2F*2Fsccn.ucsd.edu*2Fmailman*2Flistinfo*2Feeglablist*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253319451*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3D0ZWknYHCiIXcVrW2*2FTmrgY2hufRp4KeeR81*2BCOtUB0w*3D*26reserved*3D0__*3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD7Ur3gyKA*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888057540*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=HRsTP8oWIh9JKE*2B4vkKH*2BDonFQPfIEEnoVqGcJQeOqA*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKiolJSoqKioqKioqKioqKioqKiolJSoqKiUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaE6_MbJkw$
> > <
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> >
> > > <
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Fsccn.ucsd.edu*2Fmailman*2Flistinfo*2Feeglablist&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888233110*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=W*2BIzP3Th0SqSHj2P4L8ouazqghJ52hZsWwUcGZ0pj0Q*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaFEz-jR_g$
> > > .
> > > > >
> > > > > --
> > > > > Scott Makeig, Research Scientist and Director, Swartz Center for
> > > > Computational Neuroscience, Institute for Neural Computation,
> > University
> > > of
> > > > California San Diego, La Jolla CA 92093-0559,
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttp*3A*2F*2Fsccn.ucsd.edu*2F*scott*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253340446*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3D0ireFT9mF795bN4bgEOg9SzzOiBzfbLhvBEBSl*2FXZKg*3D*26reserved*3D0__*3BJSUlJX4lJSUlJSUlJSUlJSUlJSUlJSU!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD7giQR85g*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888267081*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=nxA*2BBOBJpzUBRjbTYEH04p3KuqqUWRRY5S*2FS5fUisUM*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKiUlKioqKioqKioqKioqKioqKiUlKiolJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaH8QouWCg$
> > <
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> >
> > > <
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=http*3A*2F*2Fsccn.ucsd.edu*2F*scott&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888288255*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=jF8oOxdxJIP*2BRsEo8LLLvMV0qI*2FZ9G9B10KUXU81o3A*3D&reserved=0__;JSUlJX4lJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGYcPzuKA$
> > >
> > > >
> > >
> > >
> > > --
> > > Scott Makeig, Research Scientist and Director, Swartz Center for
> > > Computational Neuroscience, Institute for Neural Computation,
> University
> > of
> > > California San Diego, La Jolla CA 92093-0559,
> > >
> >
> https://urldefense.com/v3/__https://nam12.safelinks.protection.outlook.com/?url=https*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2F*2Fnam12.safelinks.protection.outlook.com*2F*3Furl*3Dhttp*3A*2F*2Fsccn.ucsd.edu*2F*scott*26data*3D05*7C02*7Crawlse*40uncw.edu*7C5687d65a15aa4e64d03908deb033b1dc*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639141933253360104*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C*26sdata*3DAexTc5v9lgdNZw1jdpPGQgxXlcV6MHNOsEemQodk5bs*3D*26reserved*3D0__*3BJSUlJX4lJSUlJSUlJSUlJSUlJSUlJQ!!Mih3wA!AIhiGfU3uPoKEyYZGULe3B4YLszx9mBhQGd07e2ZK9SnCFUO7t1H_VXRrWWbSCO6Sxru1LMboIkoQD7fiWqVIw*24&data=05*7C02*7Crawlse*40uncw.edu*7Ce475fe096e8844b757b208deb1cc3912*7C2213678197534c75af2868a078871ebf*7C0*7C0*7C639143687888308865*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C&sdata=Tr8yDZWxy5oJ3Ilhc9*2FUIhr*2FMAzGk9CF00Y4gTdlbqo*3D&reserved=0__;JSUlJSUlJSUlJSUqKioqKiUlKioqKioqKioqKioqKioqKiUlKiUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!Mih3wA!AecfBxaMRbnkXpSJ4rvweP9891s7UjaDa-pJhM1RcUuiQnhGpaID0zFJ0jPVfcWaL8UfyBcfEsF2hxpXeaGvlSp_4g$
> > <
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> >
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> > > _______________________________________________
> > > To unsubscribe, send an empty email to
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