Hank explains the little we know about the perceptual condition known as synesthesia, where a person involuntary associates one sensation or experience with another sensation. Like SciShow? http://www.facebook.com/scishow Follow SciShow! http://www.twitter.com/scishow References: http://dft.ba/-3dKN http://www.freesound.org/people/ERH/sounds/31652/ http://www.freesound.org/people/djgriffin/sounds/20780/

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