[FieldTrip] Question about Phase locking value

[Xie Wanze]

Hi Yaocong,
Two things you may want to try: 1. use the "keep trials" option when you do
your source analysis. This method makes a lot of sense, but it did not work
for me.  2. Do source reconstruction separately for each individual trial.
You may calculate the filter in Fieldtrip using ft_sourceanalysis and then
use the filter for source reconstruction for each trial: reconstructed
source activity = filter*data (in individual trial).   This second option
worked for me.


Good luck.

Wanze



2018-02-01 19:12 GMT-05:00 Yaocong Duan <yaocong.duan at gmail.com>:

> Hi Stephen,
>
> Thank you for your response. I write something wrong in my previous email.
> the freq structure does have trails information. but then I do a source
> reconstruction and generate a source structure. phase locking value is
> calculated from the source structure directly. However, the source
> structure does not have any trails info (trails seems have been averaged).
>
> source = ft_sourceanalysis(cfg, freq);
> ...
> plv = ft_connectivityanalysis(cfg, souceSparse);
>
>
> below are the freq structure generated by freq analysis, source structure
> generated by source analysis as well as the .avg field of source structure.
>
>
> [image: Inline images 1][image: Inline images 2][image: Inline images 3]
>
> On 1 February 2018 at 18:02, Stephen Whitmarsh <
> stephen.whitmarsh at gmail.com> wrote:
>
>> Dear Yaocong,
>>
>> To understand your question, it would be helpful if you post the output
>> of the freqanalysis, i.e. your *freq *datastructure. It should contain a
>> .*pow *field, which should be an array of structs, numbering your number
>> of trials, right?
>>
>> Cheers,
>> Stephen
>>
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free.
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>>
>> On 1 February 2018 at 18:31, Yaocong Duan <yaocong.duan at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>>
>>>
>>> I am using Phase Locking Value to measure the connectivity between brain
>>> regions at the source level. I learned that the PLV is an average value
>>> over trails. In the fieldtrip code, I calculated a frequency model first,
>>> then do connectivity analysis with this freq model. The problem is I don’t
>>> see trails information in the freq model. So how do I get that phase
>>> locking result?
>>>
>>>
>>>
>>> Below is my code. This code works, but I am confused about the question
>>> above.
>>>
>>> [image: Inline images 1]
>>>
>>> Thanks in advance,
>>> Yaocong
>>>
>>> _______________________________________________
>>> fieldtrip mailing list
>>> fieldtrip at donders.ru.nl
>>> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>>
>>
>>
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>
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