[Eeglablist] How many clusters to choose for a STUDY?

[Tarik S Bel-Bahar]

sorry can't help more here, this is a pretty underdeveloped area of
published research,
although most researchers working with IC clusters have reached their own
satisfactory methods.

No I do not think that cluster-selection methods for ICA results exist in
the literature.
However, if you not a stable pattern of clustering across multiple
clustering techniques,
that should be evidence of a real cluster.

Also, you can examine the literature yourself for the scalp map
characteristics
and frequency charactersistics of certain ERP components,
and try to get clusters that show similar components in a similar task.

One thing you have to do mostly manually, or code up yourself,
is the pruning and remaking of clusters, in case the clustering
technique you choose does not sort your ICs perfectly (which is usually the
case).

See also CORRMAP as a way to derived clusters based only on scalp maps,
although the ideal cluster of ICs would give ICs that have multiple
characterstics (ERSP, scalp map, dipoles)
that match up.



The MPT toolbox for eeglab works hard to find meaningful groups of ICs
across subjects

[PDF] EEGLAB, MPT, NetSIFT, NFT, BCILAB, and ERICA: New tools for advanced *
EEG*/MEG processing<http://sccn.ucsd.edu/~arno/mypapers/ComputationIntelligenceDelorme.pdf>
[PDF] from ucsd.edu<http://sccn.ucsd.edu/~arno/mypapers/ComputationIntelligenceDelorme.pdf>
A Delorme, T Mullen, C Kothe… - Computational …, 2011 - sccn.ucsd.edu
*...* users modify while, at the same time, allowing free contribution of
new *algorithms* and methods *...*
*
*
A review of *group ICA *for fMRI data and *ICA *for joint inference of
imaging, genetic, and ERP
data<http://www.sciencedirect.com/science/article/pii/s1053-8119(08)01203-2>
[HTML] from nih.gov <http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2651152/>
UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=VD&aulast=Calhoun&atitle=A+review+of+group+ICA+for+fMRI+data+and+ICA+for+joint+inference+of+imaging,+genetic,+and+ERP+data&title=NeuroImage&volume=45&issue=1&date=2009&spage=S163&issn=1053-8119>
VD Calhoun<http://scholar.google.com/citations?hl=en&user=7pk1M78AAAAJ&oi=sra>,
J Liu… - Neuroimage, 2009 - Elsevier
*...* doi:10.1016/j.neuroimage.2008.10.057 | How to Cite or Link Using DOI
Copyright © 2008 Elsevier
Inc. All rights reserved. Permissions & Reprints. A review of *group* *ICA* for
fMRI data and *ICA* for
joint inference of imaging, genetic, and ERP data. *...* *Group* *ICA* of
fMRI data. *...*
Cited by 101<http://scholar.google.com/scholar?cites=2579355743274338430&as_sdt=2005&sciodt=0,5&hl=en>
 - Related articles<http://scholar.google.com/scholar?q=related:fgg762G2yyMJ:scholar.google.com/&hl=en&as_sdt=0,5&as_ylo=2009>
 - All 11 versions<http://scholar.google.com/scholar?cluster=2579355743274338430&hl=en&as_sdt=0,5&as_ylo=2009>
 Exploring transient transfer entropy based on a *group*-wise *ICA
*decomposition
of *EEG *data<http://www.sciencedirect.com/science/article/pii/S1053811909009057>
[PDF] from wisc.edu<http://psych.wisc.edu/postlab/readings/Vakorin_Neuroimage_2009.pdf>

UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=VA&aulast=Vakorin&atitle=Exploring+transient+transfer+entropy+based+on+a+group-wise+ICA+decomposition+of+EEG+data&title=NeuroImage&volume=49&issue=2&date=2010&spage=1593&issn=1053-8119>
VA Vakorin, N Kovacevic… - Neuroimage, 2010 - Elsevier
This paper presents a data-driven pipeline for studying asymmetries in
mutual
interdependencies between distinct components of *EEG *signal. Due to
volume
conductance, estimating coherence between scalp electrodes may lead to
spurious *...*
Cited by 10<http://scholar.google.com/scholar?cites=9003334747012793133&as_sdt=2005&sciodt=0,5&hl=en>
 - Related articles<http://scholar.google.com/scholar?q=related:LQOhLUBF8nwJ:scholar.google.com/&hl=en&as_sdt=0,5&as_ylo=2009>
 - All 6 versions<http://scholar.google.com/scholar?cluster=9003334747012793133&hl=en&as_sdt=0,5&as_ylo=2009>
 [PDF] *Group ICA *of *EEG *Toolbox (EEGIFT) Walk
Through<http://mialab.mrn.org/software/eegift/docs/v1.0c_EEGIFT_Walk_Through.pdf>
[PDF] from mrn.org<http://mialab.mrn.org/software/eegift/docs/v1.0c_EEGIFT_Walk_Through.pdf>
S Rachakonda, T
Eichele<http://scholar.google.com/citations?hl=en&user=NZbEIIYAAAAJ&oi=sra>…
- 2010 - mialab.mrn.org
This walk-through guides you step by step in analyzing *EEG *data based on
the *group ICA *

*EEG *signal classification using PCA, *ICA*, LDA and support vector
machines<http://www.sciencedirect.com/science/article/pii/S0957417410005695>
UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=A&aulast=Subasi&atitle=EEG+signal+classification+using+PCA,+ICA,+LDA+and+support+vector+machines&title=Expert+systems+with+applications&volume=37&issue=12&date=2010&spage=8659&issn=0957-4174>
A Subasi<http://scholar.google.com/citations?hl=en&user=W6FLhskAAAAJ&oi=sra>…
- Expert Systems with Applications, 2010 - Elsevier
*
*
*
*
Analysis of functional networks involved in motor execution and motor
imagery using combined hierarchical *clustering *analysis and independent
component analysis<http://www.sciencedirect.com/science/article/pii/S0730725X10000603>
UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=Y&aulast=Wang&atitle=Analysis+of+functional+networks+involved+in+motor+execution+and+motor+imagery+using+combined+hierarchical+clustering+analysis+and+independent+component+analysis&id=doi:10.1016/j.mri.2010.02.008&title=Magnetic+resonance+imaging&volume=28&issue=5&date=2010&spage=653&issn=0730-725X>
Y Wang, H Chen, Q Gong, S Shen… - Magnetic Resonance Imaging, 2010 -
Elsevier



examples of the many papers regarding clustering algorithms in general:

A roadmap of *clustering algorithms*: finding a match for a biomedical
application <http://bib.oxfordjournals.org/content/10/3/297.short>
[HTML] from oxfordjournals.org<http://bib.oxfordjournals.org/content/10/3/297.full>

UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=B&aulast=Andreopoulos&atitle=A+roadmap+of+clustering+algorithms:+finding+a+match+for+a+biomedical+application&id=doi:10.1093/bib/bbn058&title=Briefings+in+bioinformatics&volume=10&issue=3&date=2009&spage=297&issn=1467-5463>
B Andreopoulos, A An, X Wang… - Briefings in …, 2009 - Oxford Univ Press
*...* The objectives of this article are: a. to survey important *clustering
* applications in biomedicine,

*Clustering algorithms *in biomedical research: A
review<http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5594620>
UC-eLinks<http://ucelinks.cdlib.org:8888/sfx_local?sid=google&auinit=R&aulast=Xu&atitle=Clustering+algorithms+in+biomedical+research:+A+review&id=doi:10.1109/RBME.2010.2083647&title=IEEE+Reviews+in+Biomedical+Engineering&volume=3&date=2010&spage=120&issn=1937-3333>
R Xu… - Biomedical Engineering, IEEE Reviews in, 2010 - ieeexplore.ieee.org
*...* overview of the status quo of *clustering* *algorithms*, to give
examples of biom
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20120317/aa0fca36/attachment.html>