[Eeglablist] why ICA is reference-free?
Makoto Miyakoshi
mmiyakoshi at ucsd.edu
Mon Mar 17 17:29:00 PDT 2014
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>:
> 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
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