Aphantasia is a little-understood phenomenon that affects about 4 percent of the population. There are several theories behind what causes it.

The term “aphantasia” was only coined in 2015, giving a scientific label to an experience that many with the condition were completely unaware was rare or unusual.Early work by University of ...

Aphantasia is a condition where individuals are unable to generate voluntary mental images—a function most people perform ...

But if you have aphantasia you'd find that very difficult, probably even impossible. The condition didn’t even have a name until 2015, when Professor Adam Zeman of Exeter University coined the ...