Whenever this is discussed on here, there are those who say people with aphantasia are probably seeing images but don't realise, but now a study has been done that shows that they truly do not see images in their minds eye.
newsroom.unsw.edu.au/news/science-tech/windows-soul-pupils-reveal-aphantasia-absence-visual-imagination
"The study, led by researchers from UNSW Sydney and published in eLife, found that the pupils of people with aphantasia did not respond when asked to imagine dark and light objects, while those without aphantasia did."
This bit was very interesting too:
"We know that thinking in pictures or not affects the number of details in lifelong memories, how emotional we get when reading, and how we hold things in short term memory. This new method will allow us to understand the brain mechanisms of extreme imagery and the global implications for how we think, make decisions and feel.”
Those of you with aphantasia, do you ever cry reading a book?
Fascinating stuff