[JshWright]

Your experience sounds very similar to mine (even down to once visualizing a color (in my case green), which is what convinced me visualizing is really a thing and I really can't do it).

I describe my "internal" sensory experience as being similar to proprioception. In the same way you can "feel" where your left hand is relative to the rest of your body, that's how my relates to most objects/spaces.

[geoelectric]

Yes, I've also used the proprioception explanation, terminology and all. It felt a little obscure here, so I spelled it out. We must have extremely similar experiences.

I'm curious: have you noticed any effect on your memory? My autobiographical memory is poor--I remember facts about what I've experienced, but I struggle to recall the experiences themselves. I can't "mentally time travel" back to a moment to recall what it was like to be there or note new details about those recollections. I only retain whatever I notice at the time, and in a disconnected fashion as if I were remembering an incident in a book or movie.

I've read that people with similar deficiencies (such as SDAM) frequently also report aphantasia. I've often wondered if the ability to visualize might play a major role in encoding and recalling our experiences.