Aphantasia: A life without mental images.

Imagine a horse. You can probably picture one in your head.
But if you're one of the 2% of people who live with "aphantasia" then you'll see nothing.
 You know what a horse is, you know it has got four legs, but you just can't visualise one.
 Aphantasia is a phenomenon which has only recently been defined by scientists.
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