It's tough to say, as what I'd said, the amygdala, is one answer, but this is house in the hippocampus. So, I need to research this a bit more. It's interesting to me, as there are so many studies, as to how to keep our brains spry and functional. Indeed I am sorry, if the question was confusing, and as I look at it now, indeed it is unclear. My apologies. It is the first time I've written a question here, so I thank you all for responding, and hope to learn a bit more, about how to ask the questions that they may be clear. At times...who knows, I may be able to answer one, or two. Usually, they would be in the line of pharm or A&P.