Synesthesia.
Also spelled synæsthesia or synaesthesia, plural synesthesiæ or synæsthesiæ), from the ancient Greek σύν (syn), "together," and αἴσθησις (aisthēsis), "sensation," is a neurological condition in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.
In a variation of this theory, babies don't have five distinct senses but rather one all-encompassing sense that responds to the total amount of incoming stimulation. So when a baby hears her mother's voice, she is also seeing it and smelling it.
"If you ask synesthetes if they'd wish to be rid of it, they almost always say no. For them, it feels like that's what normal experience is like. To have that taken away would make them feel like they were being deprived of one sense."
-- Simon Baron-Cohen, synesthesia researcher at the University of Cambridge
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