Dear all,
 
I have realized that question no.2 may have not been very clear.  Here's an attempt
at clarifying the issue... 
 
2) Assuming normalization is not a problem, what are your thoughts on using hippocampal
volume as a covariate in the analyses?  Can adjusting for hippocampal discrepancies
through spatial normalization be viewed as taking care implicitly of hippocampal size, rendering the use
of a covariate (hipp. volume) obsolete and actually redundant IF ONE WANTS TO SPECIFICALLY
EXAMINE HIPPOCAMPAL ACTIVATION?