I have been researching about the studies with propranolol and found some very interesting PTSD info.
Like we have talked about hear, there is info that hormones are involved in conjunction with other chemicals.
We currently have been talking about isolation, and there are chemicals being researched which, when released, cause a "freeze" response to fear. I think that >clearly< relates to our desire for a neutral or isolated space. Kind of a don-t-rock-the-boat mentality for fear it will make things worse.