I often think visually, with random spurts of dialogue thrown in there. When I sit down to write a story, I imagine myself in the scene (often switching between first person perspective and then a third person shot of everyone). I like to think about different angles, so I imagine myself as the character, take in what they see, and then look down on the scene from a bird's eye view. As well as visual information, I imagine the different smells, sounds and textures/how things would feel in that environment. I switch between different characters as well if I find it necessary.
For a long time I was under the impression that almost everyone thought this way, in as much detail as I do. It wasn't until I learnt about Aphantasia that I realised this wasn't the case. Hyperphantasia is the opposite of Aphantasia, and it is something which I have. When I visualise something from memory, I remember a lot of small details such as the freckles on someone's face or where the cracks were on a certain wall.
I've had times in my life where people have asked me "Were you there when you wrote this?" or "Did you visit that place recently?" and they've been quite shocked when I replied no.
"
Wait what? How? It seems so
real!
When I read it, well it felt like I was there...how did you? What?
"
These kind of puzzled reactions tended to leave me confused, because I didn't understand how the people asking me about it couldn't seem to comprehend such things.
Similarly, I sometimes draw (and occasionally doodle aimlessly) whatever I'm visualising. I've had people ask me what reference images I used, or ask to see my references, only for me to give the rather disappointing news that I was just going from memory and/or imagination.
"Ah, I thought you'd found a good website or something that I could take inspiration from, well there goes my plans".
On the odd occasion I've made digital 3D Models before and based them on an image in my mind out of boredom. However, this only really works with items and scenes that I'm incredibly familiar with. I could easily draw a Caviller King Charles Spaniel from a visual thought, but not a car engine because I don't know much about those.
Reference images do sometimes come in handy though, now that I've learnt more about how to properly draw humans my drawings look less primitive. Previously I had a tendency to draw people too Neanderthal looking when it came to drawing faces.