[Eeglablist] EEGLAB Orientation

Thu Dec 5 08:30:39 PST 2024

Hi Cedric,

If you decide not to perform any signal processing for so called data
cleaning, do you think 20% trimming is trustworthy enough? I know it
is an empirical question. But in theory, median's breakdown point is 50%.
Since 50%>20%, why not?

Cyril once told me that if people assume Gaussian distributions everywhere
anyway, why not use median? Good point.

Makoto

On Thu, Nov 28, 2024 at 7:50 AM Cedric Cannard via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> > I have long thought that the averaging process in Welch's method should
> be replaced with median because EEG recordings can contain pretty bad
> outliers.
>
> I recommend 20% trimmed mean :)
>
>
> Cedric
>
>
>
> On Monday, November 25th, 2024 at 12:25 PM, Makoto Miyakoshi via
> eeglablist <eeglablist at sccn.ucsd.edu> wrote:
>
> > Hi Arno and all
> >
> > Thanks for your input.
> > I recommend people posted here try that plugin and tell me what it does.
> >
> > eegfiltnew() and fir_filt() are close enough, if you just
> > need band-specific powers.
> >
> > Makoto
> >
> > On Sun, Nov 24, 2024 at 12:43 AM Arnaud Delorme via eeglablist <
> > eeglablist at sccn.ucsd.edu> wrote:
> >
> > > For extracting brainwaves at specific frequencies, I would advise using
> > > the eegstats EEGLAB plugin.
> > >
> > > Best wishes,
> > >
> > > Arno
> > >
> > > > On Nov 22, 2024, at 22:09, Meha Fatima via eeglablist <
> > > > eeglablist at sccn.ucsd.edu> wrote:
> > > >
> > > > Hi. Thank you for this opportunity. I'd like to join in, too. Can you
> > > > please share the Zoom link?
> > > >
> > > > On Fri, 22 Nov 2024 at 23:34, Makoto Miyakoshi via eeglablist <
> > > > eeglablist at sccn.ucsd.edu> wrote:
> > > >
> > > > > Hi Devvarta,
> > > > >
> > > > > > Could you please open this zoom session for others as well?
> > > > >
> > > > > Sure, gather as many participants as you want and let them ask as
> many
> > > > > questions as necessary.
> > > > > I'll be available after 7:00 am in New York time (EST) which is
> 5:30 pm
> > > > > in
> > > > > Bangalore. I prefer it in the morning rather than the
> evening/night.
> > > > >
> > > > > I notice that there has been a large and constant need for
> extracting
> > > > > EEG
> > > > > power using EEGLAB, which is only partially supported by GUI.
> > > > > After our discussion, maybe I can summarize the requested
> > > > > functionalities
> > > > > into a solution in the form of EEGLAB plugin. It should be pretty
> easy.
> > > > > What I want to know is the type of output format you need most. Is
> it
> > > > > ascii
> > > > > or Excel? Do you want a result in linear scale (microV^2) or in
> dB? Do
> > > > > you
> > > > > want a mean power within a frequency band (with SD across sliding
> > > > > windows)
> > > > > or full freq bin resolution (which is already available in EEGLAB
> > > > > spectopo)
> > > > > etc..
> > > > >
> > > > > I like the idea of robust PSD proposed by Melman and Victor (2016)
> so
> > > > > that
> > > > > you do not need to worry too much about data cleaning.
> > >
> > >
> https://urldefense.com/v3/__https://pmc.ncbi.nlm.nih.gov/articles/PMC4903894/__;!!Mih3wA!Hc_qvUxHKj94lakBpoAoDLDmyqzks4elWCUSSecAgiLfWsompHx83bc4_GJA8f1FYPh9Rceqb8iycYCC-UFVaSR4uL8$
> > >
> > > > > I have long thought that the averaging process in Welch's method
> should
> > > > > be
> > > > > replaced with median because EEG recordings can contain pretty bad
> > > > > outliers. At least, outcomes from Welch's method by mean and
> median can
> > > > > be
> > > > > compared to evaluate the window-mean PSD's deviation from the
> > > > > window-median
> > > > > PSD.
> > > > >
> > > > > Grace, if this selection of time does not work for you, we can set
> a
> > > > > separate Zoom meeting. Tell me what time zone you are in.
> > > > >
> > > > > Makoto
> > > > >
> > > > > On Fri, Nov 22, 2024 at 3:42 AM Devvarta Kumar <
> > > > > devvarta.k at nimhans.ac.in>
> > > > > wrote:
> > > > >
> > > > > > Hi Mokoto
> > > > > > I assume many of us would be interested in understanding the
> process of
> > > > > > calculating power in different bands in raw EEG. Could you
> please open
> > > > > > this
> > > > > > zoom session for others as well?
> > > > > > Regards
> > > > > >
> > > > > > Devvarta Kumar, Ph.D.
> > > > > >
> > > > > > Professor
> > > > > > Department of Clinical Psychology
> > > > > > M. V. Govindaswamy Building
> > > > > > National Institute of Mental Health and Neurosciences,
> > > > > > Hosur Road,
> > > > > > Bangalore,
> > > > > > Karnataka-560029
> > > > > > India
> > > > > >
> > > > > > Ph: +91-80-26995188
> > >
> > >
> https://urldefense.com/v3/__http://www.nimhans.ac.in/users/dr-devvarta-kumar__;!!Mih3wA!E8Vsq9Vu8Q4ZAl8UIb5elP9m72UAtG-_h15RsH4N7qURhjnEctf1NKia1NpntFgQlL_UtZbHh_sQjnDjaxBj7B3Oazg$
> > >
> > > > > > ResearchGate:
> > >
> > >
> https://urldefense.com/v3/__https://www.researchgate.net/profile/Devvarta_Kumar/contributions__;!!Mih3wA!E8Vsq9Vu8Q4ZAl8UIb5elP9m72UAtG-_h15RsH4N7qURhjnEctf1NKia1NpntFgQlL_UtZbHh_sQjnDjaxBj8leJO1o$
> > >
> > > > > > ----- Original Message -----
> > > > > > From: eeglablist at sccn.ucsd.edu
> > > > > > To: eeglablist at sccn.ucsd.edu
> > > > > > Sent: Friday, November 22, 2024 1:51:05 AM
> > > > > > Subject: Re: [Eeglablist] EEGLAB Orientation
> > > > > >
> > > > > > Hi Grace,
> > > > > >
> > > > > > If your group wants to Zoom with me, I'll be available. Which
> time zone
> > > > > > are
> > > > > > you in?
> > > > > >
> > > > > > Makoto
> > > > > >
> > > > > > On Thu, Nov 21, 2024 at 2:50 PM Grace Bang via eeglablist <
> > > > > > eeglablist at sccn.ucsd.edu> wrote:
> > > > > >
> > > > > > > Hello!
> > > > > > >
> > > > > > > We are 3rd year medical students trying to conduct research
> where we
> > > > > > > collect brain wave activity data using the CGX Patch 2-channel
> EEG.
> > > > > > > We've
> > > > > > > been having a lot of issues trying to navigate how to use
> EEGLAB to
> > > > > > > process
> > > > > > > the data. We just want to be able to quantify the number of
> alpha and
> > > > > > > beta
> > > > > > > waves present in the raw data. The resources we've read online
> have
> > > > > > > been
> > > > > > > somewhat helpful, but we are looking for someone who can jump
> on a
> > > > > > > Zoom/phone call to help fill some gaps of knowledge. Neither
> of us
> > > > > > > have a
> > > > > > > background in more complicated softwares/coding/EEGs so any
> guidance
> > > > > > > would
> > > > > > > be greatly appreciated!
> > > > > > >
> > > > > > > - Grace Bang, OMS-3
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> > > >
> > > > --
> > > >
> > > > * Dr. Meha Fatima BSMT, Ph.D.*
> > > > Assistant Professor
> > > > Dow Institute of Medical
> > > > Technology
> > > > Dow University of Health Sciences
> > > > mehafatima1 at gmail.com
> > > > mehafatima1 at gmail.com.
> > > > _______________________________________________
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