Muffled
Jesus in me
I have. I've also read papers on it.
I want to make it clear that I do not assume *everyone* who "speaks" in tongues is lying. They probably believe they're doing something 100% legit. But that doesn't change the fact that if "Tongues" were a language, there would be obvious similarities between everyone who "speaks" it. If they were speaking the same language, it would be obvious. But it isn't. There is no similarities between them.
I believe there is no doubt some people do gibberish because there is pressure on them to speak in tongues so they do their best from their own mind.
I believe therein lies your problem because tongues is literally plural.
I wouldn't be surprised if those papers were written by people who didn't have a clue about spiritual matters.