A plateau happens when your brain achieves a level of automaticity; in other words, when you can perform a skill on autopilot, without conscious thought. Our brains love autopilot, because in most situations it’s pretty handy. It lets us chew gum and walk and ride bikes without having to think about it, freeing our brains for more important tasks. When it comes to developing talent, however, autopilot is the enemy, because it creates plateaus.
The Talent Code: Greatness Isn't Born. It's Grown. Here's How. (also available as an AUDIO BOOK)
Outliers: The Story of Success (the AUDIO BOOK for Outliers is great because Gladwell reads it himself)