Synesthesia (also spelled synæsthesia or synaesthesia, plural synesthesiae or synaesthesiae) from the Ancient Greek σύν (syn), meaning "with," and αἴσθησις (aisthēsis), meaning "sensation" is a neurologically-based phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.
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