ROI on connectivity measures

Discussions
1

Hi everyone!
Any chances to having a way to configure electrodes for NxN connectivity analysis?

I mean, sometimes I need just the interhemispheric measure (eg F3-F4) or to seat an specific pair of electrodes,
That would be very useful, especially on statistical testing

Thanks in advances!!
:slight_smile:

2

You can indicate the channels to be used to compute the NxN connectivity metric:

image

Is this what you meant?

EDIT:

You can do connectivity on combinations of channels by using Montages.
https://neuroimage.usc.edu/brainstorm/Tutorials/MontageEditor

The idea is to create a new recording with the process Standardize > Apply montage
Then, you can just run NxN connectivity on those files

3

Hi Thanks for your prompt response!
well, the idea is computing specific electrode pairs like: F3-F4, C3-C4, P3-P4, and then be able tu run a permutation test on these data using BST

4

You can do that:

  1. First create and save a Montage that computes the requested bipolar channels:

    image
    image950Ɨ461 24.2 KB

  2. Use the process Standardize > Apply montage to create a set of files with that montage
    image

  3. Then you can compute connectivity (e.g correlation) for those signals:

    image
    image496Ɨ504 19.7 KB

5

Well, I just tried to run the permutation test (t-paired) on specific electrodes, I set: F7,F8 but then an error warning appeared:

IMG-20241015-WA0045
IMG-20241015-WA0045900Ɨ1600 191 KB

Am I doing anything wrong? When I left that box empty the test runs with no problems, but I wanted to perform the test on specific electrodes

Note: the tested files are connectivity data (Lagged Coherence NxN with 32 electrodes)

Thanks in advances!

6

Hi @tourette95, check this post:

7

I see!
thanks for the advice :smiley: