
thumb|upright=1.2|A representation of how people with differing visualization abilities might picture an apple in their mind. The first image is bright and photographic, levels 2 through 4 show increasingly simpler and more faded images, and the last—representing complete aphantasia—shows no image at all.
thumb|upright=1.2|A representation of how people with differing visualization abilities might picture an apple in their mind. The first image is bright and photographic, levels 2 through 4 show increasingly simpler and more faded images, and the last—representing complete aphantasia—shows no image at all.
Aphantasia ( , ) is the inability to voluntarily visualize mental images.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).