Fibers outside the selected scouts

Discussions
1

Hello,

I'm really confused about the fiber display of connectivity.

I selected Desikan-Killiany atlas as scouts to calculate the N*N connectivity. Expectably, the fiber display of the connectivity results should only contain fibers within those selected scouts. But apparently there are many fibers outside the Desikan-Killiany atlas like fibers in cerebellum.

I've tried several connectivity method, but the results were similar. (I used MEG data)

Is there anyone who can tell me how to fix this problem?

スクリーンショット 2025-02-12 17.44.38
スクリーンショット 2025-02-12 17.44.381920×1051 201 KB

2

It seems that the cerebellum is included in the computation of your fibers.

Can you please list the steps you performed to obtain these results?

@Anand_Joshi any recommendations?

3

@tmedani Thank you for replying!
I followed the instruction on these tutorials:
https://neuroimage.usc.edu/brainstorm/Tutorials/FiberConnectivity?highlight=(connectivity)
https://neuroimage.usc.edu/brainstorm/Tutorials/ConnectivityGraph

The method I used was Coherence N*N, imaging coherence, and the scouts were Desikan-Killiany atlas (all the scouts).

I calculated source for each trial, and used there trial to calculate the coherence. Since I've already used the same scouts for each subject, I didn't do "project on template". The coherence is from 0 to 1, so I didn't do the normalization for coherence results. Last, I used the coherence file of each subject to do the statistic analysis (against baseline), taking each coherence file as a sample.

Is there anything wrong with my steps?

4

As far as I know, that function always computes cerebellar fibres regardless of whether the selected atlas includes them or not. In my opinion that is not a mistake as it gives more information about the connectivity :slight_smile:

5

@tourette95 Thank you for the information! I'm wondering if I can turn off the display of cerebellar fibers, because we didn't take them into consideration in our research.