spatio-temporal clustering - activation (AU) plot

[bmmansur]

MNE version: 1.2
Operating system: Ubuntu 20.04.5 LTS

Dear MNE community,

In the tutorial " 2 samples permutation test on source data with spatio-temporal clustering" there’s a figure in the end showing significant clusters.

https://mne.tools/stable/auto_tutorials/stats-source-space/30_cluster_ftest_spatiotemporal.html#sphx-glr-auto-tutorials-stats-source-space-30-cluster-ftest-spatiotemporal-py

the X axis shows the time, and the Y axis shows “activation (AU)”. AU stands for arbitrary units. Does anyone know how these arbitrary units are calculated and could give me some intuition as to what they represent?

I would like to replicate this with my own data and then publish it, but I don’t know how to label the Y axis properly.

Is there any publication that used “spatio_temporal_cluster_test” and plotted a similar graph? So that I could use it as a reference for my work?

I’d would greatly appreciate any help.

Best,

Bruno

[wmvanvliet (Marijn van Vliet)]

The units are in samples. For each vertex, the values indicate the temporal extent of the cluster at that vertex, measured in samples.

[wmvanvliet (Marijn van Vliet)]

Please note there is no such thing as a “significant cluster”. The statistical test is against the data as a whole and no statistical conclusions may be drawn from individual clusters. See here: How NOT to interpret results from a cluster-based permutation test - FieldTrip toolbox