Thank you for your answer, Kathy. Well, it seems the book is definitely something I'd like to read :-) Something a bit different from what I thought it would be, but in a good way.
If there were a secret subtitle, it would be: "how to actually get better at virtually anything, and potentially an order of magnitude faster..."
This subtitle reminds me of Josh Kaufman's book "The first 20 hours - How to learn anything... fast!". Maybe you share some ideas, or at least the goal? :-) Also, you know Daniel Kahneman's "Thinking, fast and slow"? Not exactly the same topic as your book, but my by-now favourite "brain science" book. Gave me a lot of explanations on how our brains work and how can it often trick us.