Rennie,
I read that at 18 years of age the mind drops half it's pathways in the mind to be used to strengthen essential routes in preparation for becoming adults. These spare routes double up with existing ones. Because electrical impulses are controlled by resistance these doubled up paths have less resistance and so neurons travel faster. Negative or positive makes no difference. I don't think it happens overnight, I believe it is on an as needed basis. So anxiety certainly could create these stronger synapses with repetition. Lack of use makes them salvageable. Constant positive thought weakens these routes from lack of use and strengthens the positive non anxiety routes. Amygdala has it's own memory so we will still have the ability to react in a danger situation, but Hypothalamus will not be able to add to it, positive thought makes Hypothalamus use positive memories because it has no reason not too. This cycles back to Amygdala for future use telling it not to panic for no reason. EG: thinking positive or negative conditions Amygdala and this condition directs Hypothalamus to use either positive or negative memory. Constant use strengthens the synapses in either a good or bad way.
SSRIs shut down some of the paths across the synapses but they reopen upon withdrawal. This is okay if they are now used for positive but a nightmare if they are still used for negative. Calcium helps Serotonin do it's job by carrying instructions from Hypothalamus.
When you salvage a negative route it holds back the thought that it happened so you can still put the anxiety back together using other memories. (sometimes warped and inaccurate) Each neuron is connected to a thousand others so alternate pathways just take longer to use. But once used they get stronger.
The hard part is getting people to break out of their shell and think different.
---------- Post added at 12:51 ---------- Previous post was at 12:47 ----------
I still have to be the best I can, but because it pays in the long run, not because I'm not good enough. Different core now.