[Eeglablist] why ICA is reference-free?
Iman M.Rezazadeh
irezazadeh at ucdavis.edu
Mon Mar 17 17:36:55 PDT 2014
Hi,
Yes, I did ! but I think it does not answer my question thoroughly . It
talks about the Rank in matrix and reducing it after referencing !
-Iman
From: Makoto Miyakoshi [mailto:mmiyakoshi at ucsd.edu]
Sent: Monday, March 17, 2014 5:29 PM
To: Iman M.Rezazadeh
Cc: EEGLAB List
Subject: Re: why ICA is reference-free?
Dear Iman,
Did you check out this page?
http://sccn.ucsd.edu/wiki/Linear_Representations_and_Basis_Vectors#EEG_Data_
Reference_and_Re-referencing
Makoto
2014-03-17 16:30 GMT-07:00 Iman M.Rezazadeh <irezazadeh at ucdavis.edu
<mailto:irezazadeh at ucdavis.edu> >:
Hi,
Could you please elaborate why ICA is reference-free? In other words, does
different kinds of referencing methods (avg-ref or .) effect on ICA maps and
source series ?
Suppose: x(t) is the signal then we have s(t)=M(^-1). x(t) ;where s(t) is
source signals and M is the mixing matrix.
Now how come for y=x(t)-r(t) - where r(t) is another reference- result
same/different maps and source series would be obtained and how could
someone get the same dipole locations with different re-referencing methods?
It would be great if someone gives in depth methodological and mathematical
explanations rather than just qualitative explanations.
Best
Iman
-------------------------------------------------------------
Iman M.Rezazadeh, Ph.D
Research Fellow
Semel Intitute, UCLA , Los Angeles
& Center for Mind and Brain, UC DAVIS, Davis
--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20140317/bc846afc/attachment.html>
More information about the eeglablist
mailing list