You know how on TV people listen to tapes while they sleep and when they wake up they know all the info, or whatever? Like that one Simpsons episode where Homer was going to get a weight loss tape but he ended up getting a vocabulary tape and no one could understand him because he was using un-Homer words.
Do those actually work? And under what conditions?
I mean, they seem to usually be monotone with a deep male voice, so if I were to record my German vocabulary, monotone but not having a deep male voice, would it work?