[Eeglablist] EKG from EEG
James Desjardins
jdesjardins at brocku.ca
Fri Sep 18 09:06:35 PDT 2015
Hi James, good to hear from you!
Here are some links to images that show EKG ICs.
The topographies:<http://postimg.org/image/70affygib/> Components 2 and 18 (out of a total of about 110 not shown) are typical for EKG ICs. This is from a data set where we were studying language fluency with a 135 channel BioSemi montage (that did not go particularly far down the neck... all within a standard cap). We had no intention of analysing EKG in this study. I have always found it interesting the way that ICA captures two distinct sources from the heart, but we have never tried analysing these signals in comparison to the typical bipolar EKG signals that we include in our heart specific acquisitions. Importantly I think, that because this is a massive electrical projection coming from below the head, in order for ICA to work in this way the head would need to stay in a fixed position relative to the participants chest. We use a chin rest when possible. I expect that if this participant was allowed to rotate their head during the acquisition of the data given to the ICA, that these projections would not be stationary (among the EEG recording sites) and ICA would not be able to isolate them.
The time courses of IC 2 (blue) and IC 18 (red):<http://postimg.org/image/equ2hh055/> Easily compatible with basic R-R retrieval procedures I think.
James
________________________________
From: urthbound at gmail.com [urthbound at gmail.com] on behalf of James Jones-Rounds [jj324 at cornell.edu]
Sent: September 18, 2015 10:02 AM
To: EEGLAB List; James Desjardins
Subject: Re: [Eeglablist] EKG from EEG
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<mailto: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<mailto:jj324 at cornell.edu>>
To: EEGLAB List <eeglablist at sccn.ucsd.edu<mailto: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<mailto: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<mailto:mrboyle at live.unc.edu>>
To: EEGLAB Discussion Mailing List <eeglablist at sccn.ucsd.edu<mailto: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<tel:607-255-9883>
eeg at cornell.edu<mailto:eeg at cornell.edu>
---------- Forwarded message ----------
From: Sebastian Grissmann <sebastian.grissmann at lead.uni-tuebingen.de<mailto:sebastian.grissmann at lead.uni-tuebingen.de>>
To: <eeglablist at sccn.ucsd.edu<mailto: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<tel:%2B49%207071%2029-73579>
www.lead.uni-tuebingen.de<http://www.lead.uni-tuebingen.de>
---------- Forwarded message ----------
From: "Pål Gunnar Larsson" <pall at ous-hf.no<mailto:pall at ous-hf.no>>
To: "'Fang-Yu Chang'" <hardheard101 at gmail.com<mailto:hardheard101 at gmail.com>>, "eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>" <eeglablist at sccn.ucsd.edu<mailto: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
[cid:image001.png at 01D0F14F.1F526BB0]
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<mailto: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> [mailto: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<mailto: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<mailto:nikola.valchev.umcg at gmail.com>>
To: <eeglablist at sccn.ucsd.edu<mailto: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<mailto:jdesjardins at brocku.ca>>
To: "Son, Andre" <Andre.Son at med.nyu.edu<mailto:Andre.Son at med.nyu.edu>>, "eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>" <eeglablist at sccn.ucsd.edu<mailto: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<mailto:eeglablist-bounces at sccn.ucsd.edu> [eeglablist-bounces at sccn.ucsd.edu<mailto:eeglablist-bounces at sccn.ucsd.edu>] on behalf of Son, Andre [Andre.Son at med.nyu.edu<mailto:Andre.Son at med.nyu.edu>]
Sent: September 15, 2015 9:33 PM
To: eeglablist at sccn.ucsd.edu<mailto: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<mailto:eeg at cornell.edu>
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