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Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

What do you "see" in your mind's eye? Is it as real as looking at a photo? Or do you not see any images at all? It turns out there are 3-5% of the population who don't have the ability to form images ...

Some people can't form mental images. Here's what scientists are learning about the condition known as aphantasia—and why it's less rare than you think. The "apple test"—asking participants to close ...