dr. frackowiak: if you get a stroke in this area you just wipe out your memory for space. you have just, as you lose yourself in your own home. for these experiments, we were hitting on the same area. and so it became clear that that was firstly, a critical area for this type of memory. but secondly that environment seemed to be playing a role. we made a correlation between how long you'd been in the profession and how large this part of the hippocampus was on the right side. and it was a clear relationship. the longer, the bigger. gary: it's always nice to know that i've got something bigger than everybody else has got. coyote: but, size isn't everything. brain structure volume is only a fragment of the whole story. benasich: i think we have gotten very comfortable with talking about individual brain areas particularly since the advent of fmri, because it's like, "oh my heavens look at that that has lit up! that's exactly where it's going on. but we really need to remember that the brain is very interconnected and that there's lots of information moving back and forth tha