[Eeglablist] Extracting Phase Angle from ITC Matrix

[Zachary Moran]

Thank you, everyone!  These are incredibly helpful tips.

On Fri, Nov 27, 2009 at 11:44 AM, Indir Jaganjac <ijaganjac at yahoo.com>wrote:

>   Hi Zach,
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> Mr.Bradley Voytek and Dr.Aranud Delorme have made excellent comments.
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> My experience is:
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> Inter-Trial Coherence (ITC) or phase-locking factor is important for
> detection of
> transient event-related spectral perturbation (ERSP).
> ERSP/ITC frequency range is usually in 3-25 Hz.
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> You can extract phase angle P and magnitude M, from Inter-Trial Coherence
> (ITC) matrix in this way:
> P = angle(ITC), where P is phase angle matrix in radians, for each element
> in ITC matrix (in interval -pi,+ pi).
> M = abs(ITC), where M is magnitude.
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> You can also try function phasecoher for estimating inter-trial
> amp/coherence using Gaussian wavelets:
> [amps,cohers ] = phasecoher(data,frames,srate,freq,cycles);
> amps = mean amplitude at each time point
> cohers = phase coherence at each time point [0,1]
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> regards,
> I. Jaganjac
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> From: Zachary Moran <zdmoran at gmail.com>
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> To: eeglablist at sccn.ucsd.edu
> Date: Tue, 24 Nov 2009 15:28:00 -0800
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> Subject: [Eeglablist] Extracting Phase Angle from ITC Matrix
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> Hey everyone,
>  I'm wondering whether anyone knows how to extract an estimate of phase
> angle
> (or average phase angle) from the newtimef ITC output matrix.  When I look
> at the matrix, I can see that the estimates in each cell are provided in
> complex number form - does part of this number pertain to phase angle for
> that frequency and time point?  Any help or information would be greatly
> appreciated!
> Many thanks,
> Zach
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