Are the values imported as 2nd level covariates from a simple "All Subjects" by condition (e.g., baseline TP) model of normalized ALFF signal, Fisher Z or beta values?  If beta values, how would one obtain the Fisher Z values?

Lastly, I was comparing the raw ALFF map montage to the normalized ALFF montage (see attachment) and it looks like the gaussian distribution for the normalized ALFF signal is largely centered at the grey/white matter junction?  Is this due to how the grey, white and CSF masks are handled in the noise reduction preprocessing?  What accounts for the pretty clear demarcation relative to the raw ALFF map?

Thx,
Jeff