That is exactly what tongues do. They bypass the brain. I actually think it's a pretty good illustration.
You can pray in tongues and think other thoughts at the same time. Why? Because the source of tongues is from the Spirit in a person's spirit like the illustration. The language is not generated from the mind or does it pass through the mind. Anybody that actually prays in tongues knows this. That's what I mean by not letting a non-Charismatic interpret Charismatic literature. They are trying to interpret something they couldn't possibly understand because they don't do it. I expect that illustration to be strange to a non-Charismatic because they don't understand how it works. The illustration makes perfect sense to me and is a good illustration of how tongues operate.