That's not a placebo. A placebo would be learning to play some other instrument like a piano, that doesn't involve breath. I also RTFA and saw no mention of any meaningful control group. For all they know the effects would come from learning any instrument, or just going to regular classes, or...
That's not a placebo. A placebo would be learning to play some other instrument like a piano, that doesn't involve breath. I also RTFA and saw no mention of any meaningful control group. For all they know the effects would come from learning any instrument, or just going to regular classes, or...