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Hi Stephan,
Great question. So there was a study that came out a few years ago that I thought I wrote about, but now I’m thinking maybe I didn’t because I couldn’t figure out how to make it apply to music. But this is perfect – because now I think I can write about it! Long story short, the goal is to be in your “zone of proximal development,” just outside of what’s comfortable, but not too stress-inducing. And that sweet spot for learning seems to be about 85%. So if you’re barely getting 80’s that might be a little too challenging. And if you’re getting above 90%, that might also be not challenging enough. Somewhere in the middle there is probably your best bet.
https://www.nature.com/articles/s41467-019-12552-4
Hope that helps!
Noa
