About Phase Amplitude Coupling

Discussions
1

Hi everyone!
I was reading the Phase Amplitude Coupling (PAC) tutorial, and I also read some articles too, but I have some doubts about BS PAC:

Is it a normalized measure? (I mean if it gives 0 - 1 values) or how can I understand the coupling degree?

Is it possible in BS to extract or to export to excel the PAC analysis values?

I tried the tutorial and I got the maps (comodulogram) but I'm not sure how to interpret it, since it has no specific measure units, so what does the comodulogram mean?

Is there any standardized values for this kind of analysis or how can I get if there is more or less comodularity(???? I dont know if the term exists)

Thanks in advance!

2
  • The coupling degree is the strength of PAC coupling between two oscillatory components.
  • It is positive but not normalized.
  • Export directly to Excel is not possible currently but you can always access the values as in any Brainstorm file, by loading the corresponding Matlab file and extracting the values you are interested in for further exploration.
  • The comodulogram map is explained in the tutorial: " * This coupling map, also known as comodulogram, shows the cross-frequency coupling in frequency domain. The pseudo color of the map indicates the level of coupling between each pair of low and high frequencies. The abscissa represents the frequencies analyzed as phase frequency, while the frequencies for amplitude are represented in the ordinate axis."
  • Yo ucan compare coupling strengths b/w conditions, groups, tasks etc. and run inference stats on it. The above is not entirely possible within Brainstorm yet - working on that.
3

Thank you very much!
One more question:

What is the Inter-Regional tPAC function for?

Thanks in advance!