[FieldTrip] surrogates for Phase lag index

[HINDRIKS, RIKKERT]

Hi Lidia,

I have the same question and I don't think the answer is trivial: one would
have to construct pairs of surrogate time-series under the
nullhypothesis of zero phase-lag-index. With other words: construct pairs
of time-series who's instantaneous phases are coupled
to the same extent as the recorded time-series but with zero lag. In my
case, the question is how to test for a significant lag via the
cross-correlation function.


Kind regards,
Rikkert


On Wed, Jul 9, 2014 at 8:18 PM, Lidia Mijas <lid.mijas at gmail.com> wrote:

> Hi all,
>
> I am wondering if fieldtrip has any options for computing surrogates?
> I am tryng to assess confidence level for my Phase Lag Index results ( to
> determine whether it is significantly larger then 0)
>
> But maybe someone has a better idea how to do it?
> Not sure if it matters so just to mentioned that my PLI was computed at
> the source level on beamformed signals.
>
> Many thanks for any suggestion.
>
> Lidia
>
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