[FieldTrip] surrogates for Phase lag index

[Bastien Boutonnet]

This doesn't seem to be mentioning PLI related stuff. Any more descriptive
help?

B

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


On 10 July 2014 09:41, HINDRIKS, RIKKERT <rikkert.hindriks at upf.edu> wrote:

> http://www.vis.caltech.edu/~rodri/papers/PNB.pdf
>
>
> On Wed, Jul 9, 2014 at 10:10 PM, Bastien Boutonnet <bastien.b1 at gmail.com>
> wrote:
>
>> That makes sense. How would you implement phase-randomisation? Is it
>> similar to estimating the connectivity between the same pairs of electrodes
>> but with data coming from different trials? Or even simpler?
>>
>> My interest to know about PLI/wPLI however still holds.
>>
>> B
>>
>> –
>> Bastien Boutonnet, Ph. D.
>> Postdoctoral Research Associate
>> Department of Psychology
>> University of Wisconsin, Madison
>> bastienboutonnet.com
>>
>>
>> On 9 July 2014 14:42, HINDRIKS, RIKKERT <rikkert.hindriks at upf.edu> wrote:
>>
>>> Constructing surrogate time-series for PLV is more straightforward
>>> since, in this case, the nullhypothesis is the absence of phase-locking.
>>> Surrogate pairs of time-series can be constructed for example by
>>> phase-randomization in the Fourier domain.
>>>
>>> Rikkert
>>>
>>>
>>> On Wed, Jul 9, 2014 at 9:01 PM, Bastien Boutonnet <bastien.b1 at gmail.com>
>>> wrote:
>>>
>>>> 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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>>>>
>>>>
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