Why are different kinds of learning so differently compressible?
If I can work through a textbook in 20 1-hour sittings, I usually get similar results from 10 2-hour or 5 4-hour sessions. But piano isn’t that way at all: a 20x1hr piece simply can’t be learned in 5 sessions IME.
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Very interesting! I wonder if it has something to do with proficiency: you’re much more experienced than I, and so maybe my concentration / coordination gets worn out after the first hour in a way that yours doesn’t.
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Right, that observation resonates. Activities which are fundamentally about increasing automaticity seem to reach diminishing returns relatively quickly. But when I'm working on e.g. interfaces or musicality, much of what's happening is about careful reflection, not automaticity.