<html><head><meta charset="utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi guys - Has there been any development on building a cross-channel/IC PLV routine yet? Last I see is a note by Tim (April 2011, see below) that he'll try to contribute something ...but it's not clear to me whether that has been done...<div><br></div><div>Many thanks </div><div>Agatha</div><div><br></div><div><br></div><div><h1 style="font-family: Times; ">[Eeglablist] single trial phase locking</h1><span class="Apple-style-span" style="font-family: Times; "><b>Tim Mullen</b></span><span class="Apple-style-span" style="font-family: Times; "> </span><span class="Apple-style-span" style="font-family: Times; "><a href="mailto:eeglablist%40sccn.ucsd.edu?Subject=Re:%20%5BEeglablist%5D%20single%20trial%20phase%20locking&In-Reply-To=%3CBANLkTim8ASMivFOfAg-tvNbKei86i-ZO%3DQ%40mail.gmail.com%3E" title="[Eeglablist] single trial phase locking">mullen.tim at gmail.com </a></span><span class="Apple-style-span" style="font-family: Times; "><br></span><span class="Apple-style-span" style="font-family: Times; "><i>Mon Apr 18 12:21:15 PDT 2011</i></span><div style="font-family: Times; "><br class="webkit-block-placeholder"></div><ul style="font-family: Times; "><li>Previous message: <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/003890.html">[Eeglablist] single trial phase locking</a></li><li>Next message: <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/003891.html">[Eeglablist] single trial phase locking</a></li><li><b>Messages sorted by:</b> <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/date.html#3892">[ date ]</a> <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/thread.html#3892">[ thread ]</a> <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/subject.html#3892">[ subject ]</a> <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/author.html#3892">[ author ]</a></li></ul><hr style="font-family: Times; "><span class="Apple-style-span" style="font-family: Times; "><pre>Hi,
I have not implemented any PLV code in SIFT (yet). However, SIFT
implements methods for computing time-varying spectra, coherence,
partial coherence, or multivariate Granger-causal quantities on
multiple or single-trial data using Vector Autoregressive models. You
can obtain these quantities in the frequency-domain for single-trial
data using either overlapping sliding windows and a standard VAR model
(pop_est_fitMVAR.m) or for each time point individually using a Kalman
filter (est_fitMVARKalman.m). If you are interested in driving/driver
or *effective* (causal) connectivity relationships then the GC is
generally more appropriate and interpretable than PLV or coherence
(e.g., dDTF or PDC or Granger-Geweke causality for
bivariate/trivariate systems).
I don't see how the epoching workaround proposed by Michiel for
computing sliding-window PLV using ITC would work since ITC is not the
same as the bivariate PLV. ITC quantifies the phase-locking for a
single channel across event-locked trials, but will not tell you
whether two channels are phase-locked w.r.t. each other.
I have on my TODO list to contribute a PLV function for EEGLAB, and
when I do get to this (perhaps sooner than later), I'll make sure to
include single-trial capabilities...otherwise, if anyone wants to step
to the plate, that's cool too.
In the meantime, you might take a look at SIFT for getting those
time-varying single-trial coherence or GC estimates...
Tim</pre></span><div><br></div></div></body></html>