


In one common form of synesthesia, known as grapheme–color synesthesia or color–graphemic synesthesia, letters or numbers are perceived as inherently colored. Awareness of synesthetic perceptions varies from person to person. People who report a lifelong history of such experiences are known as synesthetes. Synesthesia ( American English) or synaesthesia ( British English) is a perceptual phenomenon in which stimulation of one sensory or cognitive pathway leads to involuntary experiences in a second sensory or cognitive pathway. Most synesthetes see characters just as others do (in whichever color actually displayed) but may simultaneously perceive colors as associated with or evoked by each one. How someone with synesthesia might perceive certain letters and numbers.
