It’s common to think we all have similar experiences of life. But the more we learn about other people’s hidden thoughts, the more evidence there is that this is untrue. For instance, not everyone has the same ability to have imagined sensations. Most people can visualize—they can have imagined experiences of seeing people and scenes that aren’t there. But not everyone can.

We are both visual aphantasics, which means we can’t voluntarily imagine seeing things in our minds’ eyes. When we read a book, neither of us can imagine seeing the characters.

Yet other types of our waking imagined experiences are quite different. Derek can imagine hearing snippets of music at will, but Loren has a silent mind. She can’t even imagine hearing herself talk. Loren can have vivid imagined feelings of touch, taste and smell, but Derek doesn’t have any of these.