Some people can't see mental images

i can visualize only faint wireframes and blobs, if that makes sense. the closest analog is, my internal monologue can speak, as if i were to physically speak, but i cannot "hear" it with my ears. i can visualize "where" each part of a composite scene should go (e.g., my laptop on a table, with a whiteboard in front of me, and a window to my left), and rotate a representation of the scene, but there is no visual component aside from a very plain outline, if i concentrate.

speaking to people who claim to be able to visualize colorful scenes in 3d, with sound, etc., and truly see the scene before them --- there is probably _some_ variance. i wouldn't say it affects my cognition, but how could i really know? i've never asked my friends, but i imagine the percentage of people who use 3d visualization to reason, e.g., complex math, is small, given the number of people i've seen use the right-hand rule on exams :) (especially given aphantasia is supposedly quite rare).

i attended a talk recently on experience with organic chemistry pedagogy at a university for deaf students. few requisite terms are defined in american sign language, so the professor formed a committee to create 400 or so signs. "tetrahedral" uses four fingers in a tetrahedral formation, "chiral" moves one hand about the other to simulate a mirror, etc. education of stereochemistry wasn't necessarily heavy on visualization, as you can draw the molecule and reason about it without conceptualization in 3d, but i caught that i'd often look at clocks for R/S rotation problems (where clockwise-counterclockwise in 3d was relevant).