Indeed. There are as many exceptions to the OPs point as there are examples. In fact I will flit between those two extremes in any given day based purely on th

Indeed. There are as many exceptions to the OPs point as there are examples. In fact I will flit between those two extremes in any given day based purely on the work I'm doing. eg if I'm doing management administration then I tend to be more chatty because it's lots of small jobs that often require coordinating other people vs when I'm solving engineering problems and I just want a quiet controlled environment.