[Eeglablist] Single Trial phase locking measure

[Jerzy Achimowicz]

Dear Ming,
If I understsand properly ITC measures stability of delay=phase of transient
signal in a defined time window.
If you have a single response the only thing you can calculate is the dalay
or ERP versus time of window start
or stimulus onset time (time delay=phase*inverse of frequency of component
at which you had calculated phase).
Of course the deley is not equal to any latency of the waveform. Its a delay
of a given sinewave(frequency) fitted to single
response. To have the best fit you can insted of FFT use other (statistical)
methods to best fit a couple of sines
to a given single trial response. This is the analog to SVD.
Hope I had made it clear to you.
Jerzy
PS. Ask more if yoy have more questions on the subject of phase
synchronization !


Jerzy  Achimowicz Ph.D. Dr.Sc.
IMGW-PO
Center for Development of Numerical Forecasts
Podlesna  61 str.
01-673 Warsaw, POLAND.
phone:  office:   +48(22) 569-4130
             mobile:  +48  514-834--544

----- Original Message -----
From: "Ming Qian" <qianmi at ee.duke.edu>
To: "Scott Makeig" <smakeig at ucsd.edu>
Cc: <eeglablist at sccn.ucsd.edu>
Sent: Monday, May 01, 2006 11:02 PM
Subject: [Eeglablist] Single Trial phase locking measure


> Dear all:
>
> Inter-trial Coherence(ITC) is a statistical measure of the randomness of
> phase at each latency, across trials.  I wonder what I should use if I
> want to measure the phase locking in a single trial?
>
> Thanks for any input you might have.
>
> Ming Qian
>
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