Anecdotally, it's specialized. In the past five years I've put a tremendous amount of effort into improvising variations for 18th-century Scottish music (…don't

Anecdotally, it's specialized. In the past five years I've put a tremendous amount of effort into improvising variations for 18th-century Scottish music (…don't ask) and have noticed that things slow down and from my point of view I have all the time in the world to think about what I've played and what should come next. But for the audience I'm zipping along at 480 eighth notes per minute. Meanwhile, I'm absolutely useless at anything involving sports or a fast reaction time. I'm reminded of the section of Peak (Anders Ericsson) where chess grandmasters were excellent at remembering board positions from real games and completely average at remembering impossible board positions.