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Synesthesia (from the Greek roots syn, meaning "together," and aisthesis, or "perception") is a condition in which otherwise normal people experience the blending of two or more senses.
For decades, the phenomenon was often written off as fakery or simply memories, but it has recently been shown to be real. Perhaps it occurs because of cross activation, in which two normally separate areas of the brain elicit activity in each other. As scientists explore the mechanisms involved in synesthesia, they are also learning about how the brain in general processes sensory information and uses it to make abstract connections between seemingly unrelated inputs.
The most common form of synesthesia is the experience of colors linked to letters and numbers that they see, the sound of words or music, or smells and tastes.
Synesthetes that experience different colors when they see certain letters and numbers, experience the written language as a rush of color associations. Others may enjoy music or eating food as a colorful experience.
It is uncertain whether a person who experiences colors when seeing letters, hearing sounds, or smelling or tasting food will also experience the opposite effect when seeing various colors. This is an area for research.
Originally posted by spacedoubt
Interesting that you brought this up....
There was a news story just a few days ago...
Here it is..