LJ-SEC: (ORIGINALLY POSTED BY sunfell)

This Bodyhack article talks about the lack of activity in the language center of the brain when Pentecostals speak in 'tongues':

Researchers at the University of Pennsylvania have performed the first brain-scan study on a group of Pentecostal practitioners while they were speaking in tongues, a practice also known as glossolalia.

It turned out that activity in the language centers of the Pentecostals' brains decreased during the tests, "although the practitioners spoke in a coherent language-like way," according to an email from Mark Waldman, who is editor of Transpersonal Review and is writing a book with the lead Penn researcher on the study, Andrew Newberg.

Some would say this is proof that something is speaking 'through' them, and others would cite this as proof that they're making it all up. I guess that is up to the non/believer.