Yeah, I think I have aphantasia as I definitely don't see anything, but after reading a lot about it I still haven't totally ruled out that it's simply a big semantic misunderstanding with people that describe things in a different way.

All the easily accessible aphantasia tests (such as the one in this link) seem to rely on subjectively deciding whether you "see" or not. But this "seeing" seems to be a metaphor (even people who claim to be non-aphantasiacs will concede that it's not literally like seeing), so how do I know that other people aren't having essentially the same internal experience but choosing different words to describe it?

It also doesn't help that it doesn't seem to have any bearing on cognitive ability, or ability to perform tasks that one could effectively measure. I have never felt like I can't do something because I have aphantasia. I have seen people mentioning difficulty on problems where you need to mentally rotate a cube, but I can do that just fine - it's just that I don't "see" or "picture" the cube, but I still have the concept in my mind of the cube being in a certain orientation and that suffices to solve the task.

I have read that there are some tests for aphantasia that don't ultimately depend on introspection and vocabulary (e.g. pupils reacting to imagining something bright or dark, see https://pubmed.ncbi.nlm.nih.gov/35356890/) but I haven't found anything that I can do at home to be sure that I'm really aphantasiac and not just pessimistic about describing "inner images". If anyone knows such a test that one can do at home, I would be very interested.

I’ve see no evidence it’s anything but this. I have no idea if I have it or not or just describe stuff differently. I think this is logically much more likely. It’s a “what does it feel like to be conscious?” or “is my red your red” kind of question. There’s no external benchmark, no way to objectively compare, so you just get a spectrum of reports about the same thing.

Sometimes I think so, I don’t visually see anything in my mind it’s all just thoughts about things like I can feel the image but can’t actually see it.

However I have taken psilocybin mushrooms and when I do I can literally visualize things in my mind as crystal clear as I can see the real world. So I think it isn’t just semantics

Then you are almost certainly aphantasic. "It is all just semantics" has to do some incredible acrobatics to make sense of so much language and reported experiences, and doesn't seem biologically plausible either.

Of course, we can never be sure, but from a theoretical and empirical standpoint "all aphantasia discussion is just semantic confusion" is not useful and a complete non-starter.

I'm very convinced this is what's going on. Qualia are super hard to convey with language! If I had to guess these self-reported instruments are also measuring, indirectly, conscientiousness (do I _really_ see it? it'd be wrong to lie on a survey!) as well as neuroticism (oh God what does that mean? do I _really_ see it? do other people _really_ see it? am I broken?).

I have been wondering this as well. I took part in a study at the local university that seemed related to visualization ability. Aside from various questionnaires about imagining different types of objects, they had me do a test on a PC where I had to look at moving shapes for a few seconds at a time. The shapes would then disappear and I'd have to click on it when it reappeared in a new position a few seconds later. You were meant to be able to predict the location based on the shape's trajectory and could react faster that way.

I doubt it was trying to identify aphantasia though, since that seems like a task you could do well in even without being able to visualize the shape.

I'm sure it's not, because most of the time I'm aphantasic and rarely I'm not and they're completely different phenomenological experiences.

Aphantasia and hyperphantasia can be measured. See section 6 here: https://pmc.ncbi.nlm.nih.gov/articles/PMC11437436/

I developed full aphantasia at 16 after being put under for a heart procedure.

My minds eye was somewhat diminished after a procedure at 11 when they put me in a twilight instead of fully under.

I have a sister younger who is 6 years younger, we used to play imaginary games all the time, few years ago she asked why we just stopped playing games and it was because I couldn't see the characters anymore.

I eventually recovered like, idk, a faint outline of my parents faces from before the surgery that I can kind of conjur.

It's not semantics.

Yeah, I’m convinced this is the case. Accurately conveying something like that (the qualia of mental imagery) to another person using words is more or less impossible, in my opinion. People like to label themselves and feel special, this is an easy way to do it.