[Eeglablist] ERPS vs Time-Freq

Burgess, Adrian A.P.BURGESS at aston.ac.uk
Mon Mar 3 07:52:05 PST 2014

You might also find the following paper helpful: 'Towards a Unified Understanding of Event-Related Changes in the EEG: The Firefly Model of Synchronization through Cross-Frequency Phase Modulation' PLOS One (2012) at: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0045630

Adrian Burgess,
Professor of Psychology,
School of Life & Health Sciences,
Aston University,
Birmingham B4 7ET
0121 204 4054

From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Iman M.Rezazadeh
Sent: 02 March 2014 08:59
To: mmiyakoshi at ucsd.edu; 'Iman M.Rezazadeh'
Cc: 'EEGLAB List'
Subject: Re: [Eeglablist] ERPS vs Time-Freq

It is informative site which discusses about Evoked vs Induced ERP.

From: eeglablist-bounces at sccn.ucsd.edu<mailto:eeglablist-bounces at sccn.ucsd.edu> [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Makoto Miyakoshi
Sent: Thursday, February 27, 2014 10:48 PM
To: Iman M.Rezazadeh
Subject: Re: [Eeglablist] ERPS vs Time-Freq

Dear Iman,

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<mailto: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


Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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