US scientists have discovered people who can "hear" what they see.
The rare form of synaesthesia - a condition where senses intermingle - came to light after a student reported "hearing sounds" from a screensaver.
Researchers at the California Institute of Technology then found three more people with the same condition,New Scientist magazine reported.
Dr Melissa Saenz discovered the phenomenon when a group of students were being shown around her lab and one asked if anyone else could hear a pattern of moving dots on a computer screen.
When she questioned him further she realised he matched the criteria for synaesthesia - he had experienced it all his life and it happened with lots of different moving images.
By sending the moving dots image to hundreds of other volunteers, she found three others who could also hear sounds, such as tapping, whirring or whooshing, when watching it.
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