What, in the name of St Noah of Webster, is a "regional interaction sphere?"
I find it impossible to read anything that uses “BCE.” It is an immediate giveaway that there is some defective thinking going on.
I took a technical writing class in college many moons ago. We had a guest speaker one day who handed out these neat triple wheels to generate buzz phrases to jazz up our work. Meant in complete satire, that sort of thing has clearly now become serious academic work.
Read about the buzzword generator here; worthwhile:
Cohen buzzword generator
http://www.horton.com/cohenbuzzword.htm
I think you see one whenver Chris Christie walks fast.
An interaction sphere is an area that different cultures interact with trade, ideas, etc. The eastern Mediterranean and Mesopotamia are the earliest and best known. The term is used mostly in Anthropology and Economics. Globalization is the idea that all regions are now interrelated. Does this make sense?