By my comment above I'm trying to determine whether or not I have Aphantasia. Before I found out that some people couldn't do it, I would've described myself as someone who could visualize things. Now that I know some people can't, how do I know that I can? Is it more vivid for others? Perhaps it's a continuum, with synesthetes at the other extreme?

EDIT: someone in this thread linked to a quiz that makes me think I'm likely somewhere in the 'normal' realm.