[Eeglablist] ERPS vs Time-Freq
mmiyakoshi at ucsd.edu
Thu Feb 27 22:47:55 PST 2014
I'm not sure if there is any difference... I was not aware of it.
You may want to check dftfilt3() for the EEGLAB default wavelet (and let us
know what you find).
> And what is the difference btw evoked and induced potential.
Evoked is phase-reset to stimulus onset and induced is not. I thought
Galambos proposed this distinction, but I could be wrong.
2014-02-27 16:35 GMT-08:00 Iman M.Rezazadeh <i_rezazadeh at yahoo.com>:
> Hi ,
> What is the difference btw the traditional time-freq representation of an
> ERP and ERPS? Are they the same? Since Suppose, we have two epochs x1 and
> x2 with zero means , then
> 1- In traditional way : we make an average out of them x_avg and
> then make the Fourier transform of them F(x_avg)=F([x1+x2]/2 ) =
> F(x1/2)+F(x2/2)= [F(x1) + F(X2)] / 2
> 2- In ERPS we calculate time-freq for each epoch F(x1) and F(x2) and
> then make the average ERPS=[ Fx(1) + F(x2)] / 2
> And what is the difference btw evoked and induced potential. My questions
> are mostly from Chp 3 of the Oxford Handbook of Event Related Potential
> Components pg 77-78
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the eeglablist