Interesting that expert mnemonists (e.g. world memory champions) don't seem to be able translate that into "real-world" achievement (e.g. top execs, creatives, etc). IME insight production does seem to depend on my long-term memory performance. Not sure how to account for this.
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If you’re able to spend the thousands of hours necessary to be an expert mnemonist, you probably don’t have much else going on in your life. There’s probably a tradeoff going on there.
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In our studies, the amount of hours was not that high on average. Way less than what it takes to become an expert chess player or musician. Might be due to the young age of memory sports. Still in recent years, some beginners reach World Class in a year or two.
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That’s a very interesting angle! Even if it turns out that participating in (any) highly competitive cognitive hobby produces performance gain, various hobbies may produce those gains with different investment requirements. Maybe memory athletics requires 1/10th the time!