Aphantasia is a condition characterized by the inability to voluntarily create mental images in one's mind.
Individuals with aphantasia are unable to visualize imagery, such as picturing a scene from a book or recalling faces in their mind's eye. This does not affect their ability to think about or describe objects or events using concepts or language, but it does mean they do not have a visual component to their thoughts and memories.
Aphantasia varies in severity among those affected; some may have a complete lack of visual imagery, while others might have very limited visual representation.
It's important to note that aphantasia is not a disorder or a deficit, but rather a variation in human experience. People with aphantasia can still dream, think creatively, and remember past events, but they do so without visual imagery.