I used to think I had aphantasia, but after starting ADHD medications I've found my ability to recall visually has improved. I now can walk-through a place visually, though not at all clearly. My ability of recall has improved in every domain overall. Prior I only had access to abstractions, mainly relationships. Recalling words to describe those relationships could be difficult, even if I knew the word. The recall function would just fail, causing great difficulty communicating verbally.

I would hasten to add that I don't definitely have the condition named ADHD--there is no definitive diagnostic tool and doctors have expressed concerns of autism. I've been subjected to traumatic brain injuries too, with one leaving me temporally blind. This leaves me doubtful of being a natural example of a developed ADHD human (one not intentionally harmed and allowed to develop optimally), but of a human that has received multiple traumatic brain injuries expressing qualities of a ADHD inflicted human.

I'm aware of a condition informally named sledhead: a condition that occurs in bobsled operators (drivers?) that induces depression and often leads to suicide. I have a pet-theory that the vibrations in motor-vehicles do cause minor brain injuries as those found in the more extreme environment of bobsled racing, only differing in scale. I wouldn't be surprised if time-spent inside motor-vehicles--especially poorly maintained ones that exhibit more intense-vibrations--correlates with poorer health outcomes overall.

It would be of interest to me if anyone were aware of research that describes links between mental-imagery, autism, brain-damage, ADHD and stimulants. It's my impression that aphantasia is an expression of a deficiency in the human-brain.