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Can you picture a clear image of an object or a person in your head when thinking of them?

For many, the answer is yes. They can visualize what, for example, a cat looks like. Some can create a clearer image and hold it longer in their mind's eye than others. People with aphantasia lack this ability of visualisation. Aphantasia is the inability to voluntarily create mental images in one's mind. Aphantasiacs cannot create visions of things and people around them or picture memories or thoughts in their head.

Read more about aphantasia