Hello,
Do I need the global normalization before 2nd level analysis? What is
the global normalization?
I have 13 subjects and 2447 voxels. Before and after global
normalization give the different active regions in the brain.
I can see the high activity region has also high volatility, When
compute the t-statistics over the brain space, the values before and
after global normalization are different. For global normalization,
each measurement is scaled by global mean measurement of each subject.
What is the appropriate step?
Thanks,
Jasmine Song
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