In the 19th century, they called it “colored hearing”—letters and words, when spoken, took on mental weight and shimmered with color in the mind’s eye. For Miss C., who was interviewed in 1892, “n” ...

Not everyone's senses are separate. Those with the neurological condition can hear colors, feel sounds and even see time as different points in space. When Bernadette Sheridan hears your name, she ...