In brain analysis generally, when talking about multiple regression/GLM, the regressors are standardized, but what about the brain data? In correlational analysis it would be automatically zscored (standardized), since it's part of the computation. But in GLM it shouldn't be. Can anyone explain me this in more detail? I know this would affect the beta coefficients, but I wonder what is the usual practice or whether there is ongoing debate about it. Thanks. Ib.
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