[Eeglablist] eeglablist Digest, Vol 177, Issue 13

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Jul 22 16:48:37 PDT 2019


Dear Shweta,

I'm not a neurologist, but generally speaking seizure onset zone (SOZ) may
be identified with scalp-recorded EEG if 1) the SOZ is focal; 2) the SOZ
happens is localized in preferably scalp-measurable; 3) the SOZ involves >
6 cm^2 of (gyral) area.

My colleague neurologists use electrocorticography (ECoG) as gold standard
measurement for final demarcating of candidate regions for surgical
resection. I don't know what good estimate scalp-recorded EEG can produce
in contrast to this ECoG (there must be publications), but again generally
speaking scalp-recorded EEG has much less localizability. See this
explanation https://youtu.be/lRyZxt2WeKk?t=1562 which is from Nunez and
Srinivasan (2006) Fig 8-4. Basically, in cortical measurement FWHM = 2mm,
while scalp FWHM = 20 mm on their 4-shell spherical model and with a radial
dipole source.

Makoto

On Mon, Jul 22, 2019 at 4:33 PM Shweta Nashikar <shwetanashikar at gmail.com>
wrote:

> Sub: SEIZURE EEG dataset identification.
>
> sir/
> Here shweta Research scholar PDACE Karnatak, Is't possible for finding
> patient seizure EEG data in normal and abnormal    ?
> please take 2 min seizure data(CHB-MIT DATASET)  and explain.
>   Thanking you
>
> With regards
> shweta
>
>
> On Sun, Jul 21, 2019 at 12:30 AM <eeglablist-request at sccn.ucsd.edu> wrote:
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> > Today's Topics:
> >
> >    1. Re: ERSP outputs (Johnson, John T.)
> >    2. Re: [EXTERNAL]  from EEGLAB back to Netstation
> >       (Eriksen, Jeff :LGS Neurodiagnostics)
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "Johnson, John T." <john.johnson at gatech.edu>
> > To: Erika Nyhus <enyhus at bowdoin.edu>
> > Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
> > Bcc:
> > Date: Thu, 18 Jul 2019 18:27:59 +0000
> > Subject: Re: [Eeglablist] ERSP outputs
> > In my experience (much less than Makoto, et al.), the parameters you
> > provide are treated as requests. The time and frequency ranges actually
> > used are based on your data. Things such as the sampling rate can affect
> > the number of frequencies generated. Time can be altered by the filtering
> > method used (Hanning, etc.), number of cycles specified, etc. If I were
> > troubleshooting this, I would set a breakpoint in std_ersp.m at line 347
> > which is the call to newtimef(). The newtimef() call actually does the
> work
> > of calculating the time-frequency information. From there, you can
> inspect
> > the variables being passed to newtimef() and see if window size,
> > multi-taper, etc. are affecting your results. If this doesn’t provide
> > answers, you might need to dig into newtimef.m itself to see how the
> > parameters are modified before the calculations are performed. E.g. set a
> > breakpoint at 878 and inspect the parameters in the g struct.
> >
> > Regards,
> > John
> >
> > On 16 Jul 2019, at 15:44, Erika Nyhus wrote:
> >
> > Hi Makoto,
> >
> >
> > I am confused because when I run std_precomp it says the output
> > frequencies are 3-125 Hz, 100 frequencies and the time range is
> -240-1440,
> > 200 timepoints, but when I look at the ersp data after plotting the
> output
> > frequencies are from 3-49 Hz, 75 frequencies and the time range is
> > -100-1440, 183 timepoints.
> >
> >
> > Erika Nyhus, Ph.D.
> > Department of Psychology and Program in Neuroscience
> >
> > 6900 College Station
> > Bowdoin College
> > Brunswick, ME 04011
> > ________________________________
> > From: Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> > Sent: Friday, July 12, 2019 11:57:55 PM
> > To: Erika Nyhus
> > Cc: EEGLAB List
> > Subject: Re: ERSP outputs
> >
> > Dear Erika,
> >
> > Basic facts about the parameters can be found here.
> >
> >
> https://sccn.ucsd.edu/mediawiki/images/a/a6/C2_A3_Time-frequencyDecAndAdvancedICAPracticum_updateJan2017.pdf
> > <
> >
> https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsccn.ucsd.edu%2Fmediawiki%2Fimages%2Fa%2Fa6%2FC2_A3_Time-frequencyDecAndAdvancedICAPracticum_updateJan2017.pdf&data=02%7C01%7Cenyhus%40bowdoin.edu%7Cb8d6248ec2074b17355908d707466229%7C984e32e5f98a4600aa3227c3f948abe3%7C1%7C1%7C636985871232653522&sdata=aqeS9fx60AYuJ0445EnbfuYOYSTjdOH9QS5YDYapCjY%3D&reserved=0
> > >
> >
> > However, 'nfreqs', 100 generated 75 frequencies does not make sense. Are
> > you sure 'nfreqs' was properly recognized when you performed the
> > calculation? I have never heard of it.
> >
> > Makoto
> >
> > On Thu, Jul 11, 2019 at 11:04 AM Erika Nyhus <enyhus at bowdoin.edu<mailto:
> > enyhus at bowdoin.edu>> wrote:
> >
> > I am confused about the outputs for ERSPs in std_precomp. My data was
> > epoch from -800-2000 ms and the only inputs I set for erspparams was
> > 'cycles' [3 .8], 'nfreqs' 100, 'ntimesout' 200. I am not sure why the
> > output frequencies are from 3-49 Hz, 75 frequencies and why the time
> range
> > is -100-1440, 183 timepoints.
> >
> >
> > Erika Nyhus, Ph.D.
> > Department of Psychology and Program in Neuroscience
> >
> > 6900 College Station
> > Bowdoin College
> > Brunswick, ME 04011
> >
> >
> > --
> > Makoto Miyakoshi
> > Assistant Project Scientist, Swartz Center for Computational Neuroscience
> > Institute for Neural Computation, University of California San Diego
> > _______________________________________________
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> >
> > John T. Johnson
> > PhD Candidate - Cognitive Motor Control Laboratory
> > Lab TA NEURO 2001 Principles
> > School of Biological Sciences
> > Georgia Institute of Technology
> >
> > 678-575-2093
> > john.johnson at gatech.edu<mailto:john.johnson at gatech.edu>
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: "Eriksen, Jeff :LGS Neurodiagnostics" <JEriksen at lhs.org>
> > To: Linda Fang <lindafang.psy at outlook.com>, "eeglablist at sccn.ucsd.edu" <
> > eeglablist at sccn.ucsd.edu>
> > Cc:
> > Bcc:
> > Date: Thu, 18 Jul 2019 21:03:46 +0000
> > Subject: Re: [Eeglablist] [EXTERNAL]  from EEGLAB back to Netstation
> > Best to contact EGI (now Philips Neuro) support. If they cannot help,
> > contact me directly and I might be able to advise. My knowledge is not
> > up-to-date, though.
> >
> > https://www.egi.com/knowledge-center
> >
> > -Jeff Eriksen
> > Portland, OR
> >
> > -----Original Message-----
> > From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> On Behalf Of Linda
> > Fang
> > Sent: Thursday, July 18, 2019 10:56 AM
> > To: eeglablist at sccn.ucsd.edu
> > Subject: [EXTERNAL] [Eeglablist] from EEGLAB back to Netstation
> >
> > External Sender – Be Suspicious of Attachments, Links, and Requests for
> > Payment or Login Information.
> >
> >
> > Dear EEGLAB user,
> >
> > I tried to open the segmented EEG files in Netstation exported from
> EEGLAB
> > through the plug-in MFFMatlabIO. The type of the exported EEG file is
> MFF.
> > However, the Netstation still cannot recognize this file.
> > Does anyone know how to solve this problem?
> >
> > Thanks in advance for your help!
> > Linda
> >
> > Sent from Mail<
> >
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> > for Windows 10
> >
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-- 
Makoto Miyakoshi
Assistant Project Scientist, Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego


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