[Eeglablist] why ICA is reference-free?
Iman M.Rezazadeh
irezazadeh at ucdavis.edu
Mon Mar 17 16:30:39 PDT 2014
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
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