In a massive study of glossolalia from a linguistic perspective by Professor William J. Samarin of the University of Toronto's Department of Linguistics published after more than a decade of careful research, he rejected the view that glossolalia is xenoglossia, i.e. some foreign language that could be understood by another person who knew that language. Samarin concluded that glossolalia is a "pseudo-language." He defined glossolalia as "unintelligible babbling speech that exhibits superficial phonological similarity to language, without having consistent syntagmatic structure and that is not systematically derived from or related to known language." (William J. Samarin, "Variation and Variables in Religious Glossolalia," Language in Society, ed. Dell Haymes, Cambridge: Cambridge University Press, 1972 pgs. 121-130) http://www.meta-religion.com/Linguistics/Glossolalia/contemporary_linguistic_study.htm
Hmmmm. Who would have guessed? Self-deception? See Jeremiah 23:16-40.