The other day in class, we were talking about people who can see smells, hear sights and taste sounds. Such people who can feel these seemingly mismatched sensations have a condition called synesthesia. Little is known about how this condition is developed in those who do not inherit it genetically, but it is thought that exposure to psychedelic drugs is one potential cause of synesthesia. Another potential cause is stroke or the result of being deaf or blind.
If we look at the brain, and where centers for each of the sensations lie, they are in very close proximity to one another so it is easy to see how perhaps signals could get crossed. Why this happens, though, is still a mystery.
In his talk at the TED conference, neurologist Vilanayur Ramachandran discusses synethesia, along with a couple of other neurological phenomena--phantom pain, in which amputees feel pain in their amputated limb; and the Capgras delusion, a condition in which brain damaged patients think that their family members and loved ones have been replaced by imposters.
Do you think that there are adaptive advantages to being a synesthete? It is thought that some of history's artists and music composers were synesthetes, and that approximately 1 in 23 people are affected by some form of this condition.
Posted by scienceguru on February 8, 2008
Tags brains are cool


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