Hi, I've run a set of first level FEAT analyses, with and without intensity normalization (mainly just curiosity..). Comparing the results, at times they match fairly well, other times however the results are quite wildly different. I'm not sure what to make of it. Can I get a little more info on the point? Are the differences likely to reflect noise/movements or actual activation? And, sorry for going more basic, I know it is "generally discouraged" so when/why would it be of use?

 cheers

martin