The University of Pennsylvania has been conducting tests viewing brain images of people while they were speaking in tongues. I found reference to this in the January copy of Charima Magazine (pg. 15). A complete article on this research can be read at Newswise with this link, including the following important quotes:

“We noticed a number of changes that occurred functionally in the brain,” comments Principal Investigator Andrew Newberg, MD, Associate Professor of Radiology, Psychiatry, and Religious Studies, and Director for the Center for Spirituality and the Mind, at Penn. Our finding of decreased activity in the frontal lobes during the practice of speaking in tongues is fascinating because these subjects truly believe that the spirit of God is moving through them and controlling them to speak. Our brain imaging research shows us that these subjects are not in control of the usual language centers during this activity, which is consistent with their description of a lack of intentional control while speaking in tongues.”

Newberg went on to explain, “These findings could be interpreted as the subject’s sense of self being taken over by something else. We, scientifically, assume it’s being taken over by another part of the brain, but we couldn’t see, in this imaging study, where this took place. We believe this is the first scientific imaging study evaluating changes in cerebral activity — looking at what actually happens to the brain — when someone is speaking in tongues. This study also showed a number of other changes in the brain, including those areas involved in emotions and establishing our sense of self.”

Well it least I found it interesting. It doesn’t really affect our Biblical or Spiritual understanding of the gift of Tongues.