I'm not sure who is repeatedly downvoting my comment above. If you want to see what kind of (supernatural) evidence Treffert uses for his claims, you should rea

I'm not sure who is repeatedly downvoting my comment above. If you want to see what kind of (supernatural) evidence Treffert uses for his claims, you should read the linked article very carefully and also read his book, Extraordinary People, pages xxv - xxvi, 96, and 121 (1989 edition). A simpler explanation: people get hit on their heads, they develop new interests (sometimes due to cognitive changes), they practice their new interests a lot, and then they become skilled at them.