Microstate and spontaneous EEG

[Maria Sole Morelli]

Hi, 

I'm new with Cartool and Microstate analysis. 

I have some questions about using cartool:

- I work with spontaneous EEG and I often find segments of signal  corrupted by not eliminable artifacts. The only solution is to completely discharge them from the microstate analysis, but I don't understand how I can do it during segmentation. I see that it is possible to choose epochs but I'm not sure this could be the right solution. I mean, epochs are used in ERPs, not in spontaneus EEG. Is there anyone that had my same problem and solved it?

- I'm able to see maps of different segments (1443 segments), but I'm not able to see the clusters (4). How can I do it?

Thank you in advance!!!!

Maria Sole

[Guofa Shou]

hi, All, 

   Following Maria's question, I also would like to know how to do microstate analysis on resting-state EEG data. I have 40 subjects, each one has 5 mins of rs-EEG signal. When I try to import all data into cartool and do segmentation, it always tell me the issue of out of memory.

  Maria, 

     It seems you can do segmentation, do you do it on group data or on one subject?

Thank you in advance.

Guofa Shou

       

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From: car...@googlegroups.com <car...@googlegroups.com> on behalf of Maria Sole Morelli <msole....@gmail.com>
Sent: Thursday, February 25, 2016 10:23 AM
To: Cartool Community
Subject: [Cartool Community] Microstate and spontaneous EEG

 

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[Maria Sole Morelli]

I did  segmentation on one subjects, just to try Cartool and to learn how to use it. In future I would like to perform segmentation also considering a group. 

 I considered only 200 seconds of continuos data (because of artifacts) but I had to downsample sample frequency from 250 Hz to 50Hz . With higher sample frequency the same problem with memory occured. 

[Guofa Shou]

Thanks, Mara.

I am wondering is it a common way to segment microstate for resting-state EEG?

the tutorial about spontaneous EEG in cartool forum (https://sites.google.com/site/cartoolcommunity/user-s-guide/analysis/spontaneous-eeg) seems to me still the epoch data. Could you somebody kindly provide us a guide to do segmentation on two groups' data, each subject has around 5 mins with sampling frequency as 250?

Considering the memory issue, for each subject, may I firstly divide each subject data into two or four parts, then do microstate analysis on each one?

Thanks,

A - Spontaneous EEG - Cartool Community - Google Sites sites.google.com Spontaneous EEG with Cartool Original contribution from Verena Brodbeck & Lucas Spierer Single trial / individual subject and/or group level Cartool analysis of ...

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From: car...@googlegroups.com <car...@googlegroups.com> on behalf of Maria Sole Morelli <msole....@gmail.com>

Sent: Thursday, February 25, 2016 3:39 PM
To: Cartool Community
Subject: Re: [Cartool Community] Microstate and spontaneous EEG

 

[Jeff Eriksen]

Mara, Guofa,

 

I am also interested in using microstate segmentation on resting state (eyes open fixation and eyes closed awake) EEG (256 channel) but am unsure how to do that. No tasks, no events, just 5-20 minutes of continuous EEG. Please let me know what you find out.

 

-Jeff Eriksen

OHSU, Dept Behavavioral Neuroscience

erik...@ohsu.edu

 

From: car...@googlegroups.com [mailto:car...@googlegroups.com] On Behalf Of Guofa Shou
Sent: Friday, February 26, 2016 1:50 PM
To: Cartool Community
Subject: Re: [Cartool Community] Microstate and spontaneous EEG

 

Thanks, Mara.

I am wondering is it a common way to segment microstate for resting-state EEG?

the tutorial about spontaneous EEG in cartool forum (https://sites.google.com/site/cartoolcommunity/user-s-guide/analysis/spontaneous-eeg) seems to me still the epoch data. Could you somebody kindly provide us a guide to do segmentation on two groups' data, each subject has around 5 mins with sampling frequency as 250?

Considering the memory issue, for each subject, may I firstly divide each subject data into two or four parts, then do microstate analysis on each one?

 

Thanks,

[Guofa Shou]

Hi, Jeff, 

     Yes, it seems this topic is pretty interesting, I am pretty sure many people have conducted this kind of studies, at least based on relevant literature. 

    I am looking forward to hearing some solutions/guidelines from the authors of Cartool or others.

Guofa Shou

University of Okahoma

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From: Jeff Eriksen <jeffe...@comcast.net>
Sent: Saturday, February 27, 2016 9:54 PM
To: car...@googlegroups.com
Cc: msole....@gmail.com; 'Guofa Shou'
Subject: RE: [Cartool Community] Microstate and spontaneous EEG

 

[Daniel Palacios]

Hello,

I was wondering if anybody here was able to find a solution. I have been trying to figure this out for about a week now, trying all the different ways that the various tutorials suggest, however I can never seem to find anything that looks correct.

What have your final experiences been like?

Thank you,

best,

Daniel

[Sara]

Hi,

I'm new in Cartool and in microstate analysis.

I'm having the same problems that you found some years ago. How did you solve them?

If someone could answer me, I would be very gratefull.

Thank you,

Sara

[Armen Bagdasarov]

This still seems like an unanswered thread. I'm wondering if anyone has figured out how to do microstate analysis of spontaneous/unepoched resting-state EEG in Cartool. The Cartool user/reference guide seems very specific to ERPs and the Spontaneous  data section is not very helpful. I've done microstate analysis in Matlab/Eeglab, but would like to use Cartool to implement source localization.

[victor ferat]

Hey Armen,

To answer the previous message, to exclude bad segments, use the "But exclude Bad Epochs" box in the segmentation/fitting window, then type the marker name you use to mark bad segment in your data (often "bad", "artefact", "art" or whatever you use during your cleaning steps). The use of the word 'epochs' may sow doubt, but this is indeed a period marked in the marker file, no need to use epoched data.

Best regards,

___________________________________________

Victor Férat,  Phd Sudent

Functional Brain Mapping Lab, University of Geneva

Campus Biotech, Chemin des Mines 9, 1202 Geneva, Switzerland

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De : car...@googlegroups.com <car...@googlegroups.com> de la part de Armen Bagdasarov <abagda...@gmail.com>
Envoyé : mercredi 20 janvier 2021 16:32
À : Cartool Community <car...@googlegroups.com>
Objet : [Cartool Community] Re: Microstate and spontaneous EEG

 

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