[FieldTrip] surrogates for Phase lag index

[Bastien Boutonnet]

I guess I will tag along to this discussion, in saying that I have been
having the same burning question for a while.

My issues have been along those lines: when I run some kinds of
connectivity analyses (be it PLI, wPLI or PLV), how do I make sure the
values I obtain are "legal" (or different from 0).

B

–
Bastien Boutonnet, Ph. D.
Postdoctoral Research Associate
Department of Psychology
University of Wisconsin, Madison
bastienboutonnet.com


On 9 July 2014 13:39, HINDRIKS, RIKKERT <rikkert.hindriks at upf.edu> wrote:

> 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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>
>
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