Fit atlas - Overlap detected in the maps

fmri
neuroimaging
nilearn
#1

Hey guys,

I am trying to fit the Allen atlas on a dataset using:

masker = input_data.NiftiMapsMasker(
    allen.rsn28,
    resampling_target="data",
    t_r=2.5,
    detrend=True,
    allow_overlap=False,
    memory='allen',
    memory_level=1,
    verbose=0)

But, on some of my subjects I get the following error:

ValueError: Overlap detected in the maps. The overlap may be due to the atlas itself or possibly introduced by resampling

I made sure first to resample my data in the MNI space, but even without this step, I get the same error.
I tried other atlases such as the Power and Dosenbach (networks), but the same issue (even when adjusting the radius of the spheres and the fwhm).

Any suggestions on this issue? Is there a general rule, such as, is it properly (usual/normal/ok to allow overlap)? or, to exclude these subjects from the analysis?

Kind regards,
Makis

#2

Is this happened with allow_overlap=True ?

#3

No, with

allow_overlap=True

, works; but it raises other questions, such as is it methodologically-speaking accepted/usual? and how is it gonna affect the correlation between the maps and further analyses?

#4

You can try extracting signals map-by-map and compare them, may be. this can be one more option.

I am not good at answering methodologically.