The Smell of Green Thunder: How Does Synesthesia Differ from Hallucination?
In a condition called synesthesia, the signals between the senses are often crossed. It manifests itself in a variety of fashions and in varying intensities. Synesthetes often report hearing colors or smelling sounds, which to some is an infinite source of amusement, and for others, a source of annoyance. But are these experiences hallucinations? Or are they just as real as the rest of the world around them?
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Photo courtesy of Stephen Lock.