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I would like top know whether Ms. Gaertner has worked one-on-one with students of different ages, over years, and in close communication with them including how they practice, their sleep patterns, their experiences and so on. I highly suspect that none of these things exist. There will only be studies and studies are limited, restrictive, and artificial.
I turned 70 this year. An absolute reality of age is that I have just spent a week researching the best options for cataract surgery and physical vision does affect musicking. I'm going back to proprioception after having perfected sight reading. Good body use matters more with increased stiffness.
I've been looking deeply into alternate ways of practising and learning for close to 20 years now, and have applied a lot of the things I learned. I've known of these principles of rest and sleep for 20 years, long before it started to get discussed, and they have been, and are effective. My ability to learn is far superior to what I had at a younger age because of this. I don't care to know what supposedly I'm not able to do, or do as well, because of what some or several studies state.
I started this journey close to 25 years ago. That is, I had always done music self-taught, with some hiatuses, but for the learning path. Three years in I started to look at what was being written back then. There was this "hardened wax" theory (my word for it) - after age xx everything you have is in its final shape - my "non-hardened wax" idea is now called neuroplasticity. I'm glad I didn't know what I wasn't supposed to be able to do when I started; such beliefs have always undermined students as it goes to expectations and goals (even of those teaching them).
There ARE other factors. Manner of learning and teaching - is teaching more intellectual - if a child were taught as some adults are, would the child have the same problems? Why do kids learning a new language in school barely progress, whereas if they are thrown into a new country, they become fluent? Is it because they are being taught in the way adults are taught, by adults?
When I started a new instrument and with a teacher for the first time, I took the typical trajectory - fast start and sudden crash. Typical adult? Or because of how it was done? The 7 year old doing the RCM gr. 1 exam ahead of me had taken 2 years to get there, as opposed to my 6 months - and at the start of the 2nd year I crashed and didn't recover while mid grade-4 - where this child was probably doing grade 2; properly, slowly, concretely. It was that crash which got me started looking at the whole kaboodle.
My trust of studies is limited.