[Eeglablist] EKG from EEG

James Jones-Rounds jj324 at cornell.edu
Fri Sep 18 07:02:07 PDT 2015


Hi James,

Could I trouble you to respond to the list with a screen shot of the
component properties (i.e. scalp topography, ERP, ERP image, and power
spectra) for the EKG component that you find? A lab I work with is
interested in isolating heart-evoked potentials and this might be a step in
that direction..

Thank you!

James

On Thu, Sep 17, 2015 at 6:52 PM, <eeglablist-request at sccn.ucsd.edu> wrote:

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> Today's Topics:
>
>    1. Re: Registering EGI 128 Channel GSN Electrode     Locations to
>       BESA/BEM Coordinates (James Jones-Rounds)
>    2. Tool to find anatomical brain regions (with function) based
>       on talairach coordinates (Sebastian Grissmann)
>    3. Re: Question regarding color interpretation (P?l Gunnar Larsson)
>    4. CIAC toolbox problem (Nikola Valchev)
>    5. Re: EKG from EEG (James Desjardins)
>
>
> ---------- Forwarded message ----------
> From: James Jones-Rounds <jj324 at cornell.edu>
> To: EEGLAB List <eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Thu, 17 Sep 2015 15:18:30 -0400
> Subject: Re: [Eeglablist] Registering EGI 128 Channel GSN Electrode
> Locations to BESA/BEM Coordinates
> Hi Michael,
>
> I've had this problem in the past, too, using BioSemi's 128-channel
> system, which uses the ABCD montage (not 10-20). I had to do some manual
> warping, in the end, and I tried about a dozen set of parameters (x-, y-,
> and z-shift, pitch, roll and yaw, and radius changes in each dimension as
> well). For "pop_dipfit_settings", I use the standard MNI template brain
> image provided in EEGLAB's BEM folder, the BEM "standard_vol_SCCN.mat", and
> the "standard_alphabetic.elc" coordinate file, and these co-registration
> parameters:
>
> 'coord_transform', [0 -12  5  -0.1  0 -1.5708 97.88 92 97.8781]
>
> This both looks qualitatively like the electrodes are all on the scalp,
> and out of the dozen or so parameters I tried, is the one that maximizes
> the number of components with residual variances under 25%, which I take as
> a general sign of accuracy and good-fit. Nevertheless, most of my dipoles
> are always stuffed a bit further into the brain than I think is accurate
> (assuming that the cortex is what is primarily responsible for the EEG
> signal in the first place).
>
> I am soon going to be working on a project that has structural MR scans
> for each participant, which I hope will help improve the localization from
> the dipole-fitting process.
>
> Hope that helps!
>
> James
>
> On Thu, Sep 17, 2015 at 3:00 PM, <eeglablist-request at sccn.ucsd.edu> wrote:
>
>>
>>
>>    1. Registering EGI 128 Channel GSN Electrode Locations to
>>       BESA/BEM Coordinates (Michael Boyle)
>>    2. Re: Processing Startle in EEGlab (Tara Miskovich)
>>
>>
>> ---------- Forwarded message ----------
>> From: Michael Boyle <mrboyle at live.unc.edu>
>> To: EEGLAB Discussion Mailing List <eeglablist at sccn.ucsd.edu>
>> Cc:
>> Date: Wed, 16 Sep 2015 22:36:47 +0000
>> Subject: [Eeglablist] Registering EGI 128 Channel GSN Electrode Locations
>> to BESA/BEM Coordinates
>> Hey all,
>>
>> I have been trying to get a good registration between the sensor
>> locations provided by EGI for their 128 channel geodesic sensor net and the
>> default BESA and BEM coordinate systems that DIPFIT provides, but the
>> results are quite unsatisfactory with the standard warping methods (no
>> manual warping). I have tried using the automatic warp when aligning just
>> the 10-20 sensor locations, the 10-10 sensor locations that EGI reports to
>> be within 1cm of an EGI GSN electrode (
>> ftp://ftp.egi.com/pub/documentation/technotes/HydroCelGSN_10-20.pdf),
>> both with and without fiducials, and even just assessing the correspondence
>> visually shows that the fits are quite poor. I was wondering if anyone has
>> had success getting a good registration particularly with the BESA
>> coordinates, since that is the dipole fitting method I've converged on. The
>> most noticeable issue with my registrations is with the frontal electrodes
>> in either model (the Fz's for example are clearly not well coregistered).
>> Possibly as a result, I have had, in a few cases, DIPFIT place the
>> well-fitting dipole for eye blink components slightly within the brain and
>> thus not automatically exclude them.
>>
>> I can send pictures of my best attempts at registration to anyone
>> interested.
>>
>> Thanks for your help!
>> Michael
>>
>>
>> --
> James Jones-Rounds
> Laboratory Manager
> Human Development EEG and Psychophysiology (HEP) Laboratory,
> Department of Human Development,
> --------------------------------------------
> Cornell University | Ithaca, NY
> 607-255-9883
> eeg at cornell.edu
>
>
> ---------- Forwarded message ----------
> From: Sebastian Grissmann <sebastian.grissmann at lead.uni-tuebingen.de>
> To: <eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Thu, 17 Sep 2015 11:17:10 +0200
> Subject: [Eeglablist] Tool to find anatomical brain regions (with
> function) based on talairach coordinates
> Hi there,
>
> I´m new to IC-based cluster analysis and I´m having a hard time
> interpreting the component clusters in my data. Now I´m looking for a tool
> that helps me to find brain regions (preferably, with corresponding
> functionality) based on talairach coordinates of the cluster centroids.
>
> Can anyone help me with that?
>
> Best,
> Sebastian
>
>
> --
> Sebastian Grissmann (Mag. rer. nat)
> PhD student
>
> LEAD Graduate School
> University of Tübingen
> Gartenstrasse 29 (1st floor)
> 72074 Tübingen
> Germany
> Phone  +49 7071 29-73579
>
> www.lead.uni-tuebingen.de
>
>
>
>
> ---------- Forwarded message ----------
> From: "Pål Gunnar Larsson" <pall at ous-hf.no>
> To: "'Fang-Yu Chang'" <hardheard101 at gmail.com>, "eeglablist at sccn.ucsd.edu"
> <eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Thu, 17 Sep 2015 11:45:32 +0000
> Subject: Re: [Eeglablist] Question regarding color interpretation
>
> A medial source may give this - see example below
>
>
>
>
>
> Dr. philos. Pål G. Larsson
>
> Seksjonsleder Klinisk nevrofysiologi
>
> Nevrokirurgisk avdeling
>
> Oslo Universitetssykehus
>
> Postboks 4950 Nydalen
>
> 0424 Oslo
>
>
>
> Tlf.:  23074407
>
> Mobil: 93429791
>
>
>
> E-mail: pall at ous-hf.no <pal.gunnar.larsson at ous-hf.no>
>
>
>
> Denne meldingen innholder ikke sensitiv informasjon som bryter med Ous
> sine regler for taushetsplikt
>
>
>
> *Fra:* eeglablist-bounces at sccn.ucsd.edu [mailto:
> eeglablist-bounces at sccn.ucsd.edu] *På vegne av* Fang-Yu Chang
> *Sendt:* 14. september 2015 14:28
> *Til:* eeglablist at sccn.ucsd.edu
> *Emne:* [Eeglablist] Question regarding color interpretation
>
>
>
> Dear EEGLAB users,
>
>
>
> I have a question regarding the scalp map color bar. I have read the
> following webpage:
>
>
>
> http://sccn.ucsd.edu/pipermail/eeglablist/2003/000030.html
>
>
>
> Based on my understanding, red and blue both indicate activation, but
> opposite polarity. My question is, if there's an event that results in one
> side of the brain having red readings while the other side has blue
> readings, how would this data be interpreted?
>
>
>
> Sincerely,
>
>
>
> Stella Ling
>
>
> ---------- Forwarded message ----------
> From: Nikola Valchev <nikola.valchev.umcg at gmail.com>
> To: <eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Thu, 17 Sep 2015 15:37:57 +0200
> Subject: [Eeglablist] CIAC toolbox problem
>
> Dear experts,
>
> I’m encountering some problems in making the CIAC toolbox work.
>
> I presume it needs a study to be loaded and not just a dataset and that is
> fine but, even if I do so the CIAC option in the “study” menu is not
> available. (Although the plugin is installed correctly and the Statistics
> Toolbox (matlab) together with the DIPFIT plugin (eeglab) are installed.)
>
>
>
> If I run the CIAC script (pop_ciac) from the command line I get an error:
>
>
>
> >> [ciac,STUDY,ALLEEG] = pop_ciac('C:\eeg_anita\data\S15_CI\test_2.study',
> 'ALLEEG')
>
> Improper index matrix reference.
>
>
>
> Error in ciac (line 68)
>
> if length(size(ALLEEG(1).data))~=3
>
>
>
> Error in pop_ciac (line 93)
>
> [CIAC,STUDY,ALLEEG] =
> ciac(STUDY,ALLEEG,dur,twind,th_rv,th_der,th_corr,cz,pl);
>
>
>
>
>
>
>
> Thank you in advance!
>
> Nikola
>
>
>
>
> ---------- Forwarded message ----------
> From: James Desjardins <jdesjardins at brocku.ca>
> To: "Son, Andre" <Andre.Son at med.nyu.edu>, "eeglablist at sccn.ucsd.edu" <
> eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Thu, 17 Sep 2015 17:15:36 +0000
> Subject: Re: [Eeglablist] EKG from EEG
> Hi Andre,
>
> We find regularly that if your EEG montage goes down far enough onto the
> participant's neck that running ICA on the continuous data will isolate
> clear EKG signals (often two). For the data where this isolation occurs the
> quality of the independent component EKG signal would often allow for
> RR-interval assessment.
>
> James
> ------------------------------
> *From:* eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu]
> on behalf of Son, Andre [Andre.Son at med.nyu.edu]
> *Sent:* September 15, 2015 9:33 PM
> *To:* eeglablist at sccn.ucsd.edu
> *Subject:* [Eeglablist] EKG from EEG
>
>
> Hello,
>
> I am very new to MatLab but am interested in retrospectively extracting
> data from EEG’s.
>
> I have existing EEGs for subjects but would like to look at changes in EKG
> measurements utilizing the existing EEGs.
>
>
>
> At the very minimum, we would like to get RR-intervals to assess subjects’
> heart rates… Is there a way to accomplish this task?
>
>
>
> Thanks so much,
>
> AS
>
>
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-- 
James Jones-Rounds
Laboratory Manager
Human Development EEG and Psychophysiology (HEP) Laboratory,
Department of Human Development,
--------------------------------------------
Cornell University | Ithaca, NY
607-255-9883
eeg at cornell.edu
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