fMRI scans can be interpreted any way you want. Much like statistics, you have to choose you "base" for evaluation. Also, so far the brainscan method is more of a magic ball approach rather than science.
Read along here:
fMRI Gets Slap in the Face with a Dead Fish
http://blogs.discovermagazine.com/neuroskeptic/2009/09/16/fmri-gets-slap-in-the-face-with-a-dead-fish/
Sorry, but your post about the salmon has no correlation to which I am referring.