[Eeglablist] Different clusters within thalamus?

[Arnaud Delorme]

Dear Aleksandra,

the Thalamus as all subcortical structure most likely has a minor effect on scalp EEG (because it is a node, if all neurons are active at the same time, their net potential is null). A perfect spherical domain of synchrony cannot be seen on the scalp.

Now the interaction between the thalamus and the cortex is what might be seen. I guess it would be seen as ICA components with a cortical location.

Best,

Arno

On 22 Mar 2013, at 17:48, Makoto Miyakoshi wrote:

> Dear Aleksandra and Tom,
> 
> > However Tom's email indicates that the source analysis model used in EEG lab is not adequate for localising sources in deeper structures, or I got it wrong?
> 
> My naive thought is that thalamus is involved in alpha rhythm but that does not mean it project it to the scalp. It is one of nodes of network that drives the occipital cortical patches to oscillate in alpha. Let me know if you find more information about it.
> 
> Tom's input is informative as usual. Thanks.
> 
> Makoto
> 
> 2013/3/19 Aleksandra Vuckovic <Aleksandra.Vuckovic at glasgow.ac.uk>
> My modest understanding is that thalamus generates rhythmic oscillatory activity and is one of the generators of the alpha rhythm. I taught therefore that it should not be surprising that some ICs are located in thalamus. However Tom's email indicates that the source analysis model used in EEG lab is not adequate for localising sources in deeper structures, or I got it wrong?
> Thanks,
> Aleksandra
>  
> From: Makoto Miyakoshi [mmiyakoshi at ucsd.edu]
> Sent: 19 March 2013 17:14
> To: Aleksandra Vuckovic
> Cc: EEGLAB List
> 
> Subject: Re: [Eeglablist] Different clusters within thalamus?
> 
> Dear Aleksandra,
> 
> >Even some that I see consistently across subjects?
> 
> Consistency across subjects does not increase the possibility that the ICs are really located in or near thalamus, unless you are using the combination of digitized channel locations, subject's MRI head image, and Zeynep Akalin Acar's NFT...
> 
> To generate a dipole, neuron arrays should have a specific pattern. I'm not sure if thalamus also has this pattern. It's a matter of cytoarchitecture, so you may want to read papers about electrophysiological mechanism of generating EEG. I don't know much about it, so if you find something interesting please share with us. 
> 
> Makoto
> 
> 2013/3/19 Aleksandra Vuckovic <Aleksandra.Vuckovic at glasgow.ac.uk>
> Hi
> does it mean that these sources are not of a physiological origin (EEG related)? Even some that I see consistently across subjects?
> Many thanks,
> Aleksandra
>  
> From: Makoto Miyakoshi [mmiyakoshi at ucsd.edu]
> Sent: 19 March 2013 00:27
> To: Aleksandra Vuckovic
> Cc: eeglablist at sccn.ucsd.edu
> Subject: Re: [Eeglablist] Different clusters within thalamus?
> 
> Dear Aleksandra,
> 
> Independent components located in or near thalamus should be mostly due to localisation error in dipole fitting (forward model error/inverse solution error/channel location error/...etc). We see it often though :-)
> 
> Makoto
> 
> 2013/3/16 Aleksandra Vuckovic <Aleksandra.Vuckovic at glasgow.ac.uk>
> Hi
> has anybody tried to cluster components at different locations within thalamus and according to which criteria?
> Many thanks!
> Aleksandra
> 
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> 
> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
> 
> 
> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
> 
> 
> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
> _______________________________________________
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