Inter regional tPAC

1

Hi,

We are trying to do tPAC of resting state MEG data between two scouts.
In the Brainstorm database it looks like Brainstorm computes tPAC between one vertex of the seed scout (because in the result Brainstorm adds the vertex number to the file name) and all separate vertices of the source scout (because we can switch between all vertices to see separate result per vertex).

Is this correct? And is there a possibility to compute tPAC between the average of all vertices in the scout and have only one result between scout 1 and scout 2?

screenshot_tpac
screenshot_tpac1052×870 58 KB

Thanks,
Nienke

2

@Samiee @MartinC @Sylvain?

3

Soheila's response:

Hi Nienke,

That is correct, it computes tPAC between one seed (based on your selection: default is fp region because slower rhythms have lower spatial resolution) and all sources in the second region.

Averaging sources of a scout before computing tPAC is not recommended, because it ruins the high frequency components in your data, but you can easily average tPAC maps from all sources in your scout of interest afterward using this function:

Run > Frequency > Time-resolved PAC > Basic analysis of tPAC maps > Mean (over sources).

Best,
Soheila

4

Thank you for your response!