alt Hacker NewsHere's my problem with this: take an fMRI of a bunch of professional jugglers while they imagine juggling. Now take an fMRI of a bunch of non-jugglers while they imagine juggling. I promise you they will be strikingly different, with the professionals having all sorts of real-life coordination areas lighting up.
Conclusion: some people are a-juggular and are wholly incapable of imaging juggling. Poll: are you a-juggular or not!?
I hope this illustrates how we're missing a very sensible third option here: visualizing is a skill that some people are better at than others, but (almost) anyone can learn.
Learning to juggle involves easily observed objective activities that other people can check, and which can be learned that way--you can watch someone else juggling, read book that describes the tossing of the balls, etc.
How do you do any of that with visualizing? If I'm trying to learn to juggle, I can watch someone else juggling and say, I want to do that. How do I watch someone else visualizing and see what to do?