I read an article some time ago that claimed you used different parts of the brain for different languages and your thought processes were affected by the language you were thinking in.
It is partly to do with the methodology of how the language is constructed.
When I think in French, which isn't very often these days, I am constrained by my French vocabulary and can stumble to "put my thoughts together" in a logical framework.
Apparently, Chinese people have totally different thought patterns to Europeans, and use a different part of the brain when having them according to the article.
I have an interest in ancient languages, particularly the branching from the 'Tocharian'. Have you studied such?