I’ve read tons of these and still have no idea if I have aphantasia or not. I can’t understand whether people just have different ways of describing what’s in their minds eye or if there’s really a fundamental difference.
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I am terrible at visual art because I struggle to picture what I am drawing before I draw it. When I do calculus problems, I have to write down in full every intermediate step because I can't visualize how the equations change more than one or two steps in the future.
Those kinds of things seem to me like more objective measures of someone's ability to visualize, although I have nothing other than anecdotal evidence to back that up.