Dear all,I have several questions concerning the global normalisation. I found that the activation of my task (overt picture naming) when the option of 'None' was choosen in global normalisation at the first level is remarkably different from that when the 'scaling' was choosen. But I don't know why the big difference happens. Is it appropriate to use the way of 'scaling' to do global normalisation at the firs level for fMRI data?On the other hand, how about the global normalisation when specify factor design at the 2nd levle analysis? Could I choose scaling at both levels?I wish obtain some suggestion from you. Thanks a lot!Ivan