In the peculiar world of synesthesia, people experience an involuntary joining of different sensations. These individuals may, for example, feel intense facial pressure when listening to music or see vivid colors in response to spoken words.
“Colored hearing,” probably the most common form of synesthesia, arises in the brain through a process similar to that responsible for hallucinations of colors, according to brain-imaging data in the April Nature Neuroscience.
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