I also have aphantasia. I'm hoping that if they start running these tests on humans that they make sure they bring in people with aphantasia. Something like 1 in 20 of us have it. For example, when I daydream, I lose myself and come back to myself a short time later. It's kind of like highway hypnosis, but I do know what I was thinking about, it just happened "off-screen" so to speak and I become aware of it all at once. It would be interesting to know if the same regions of the brain are lighting up. Maybe we can figure out what aphantasia is, from an anatomical perspective.