Researchers and experiencers have long struggled with defining the hard-to-wrangle trait known as synesthesia. And media attempts are even worse. I'd like to take a stab at advancing a more complete, ...

Add Yahoo as a preferred source to see more of our stories on Google. Ever since I can remember, numbers have appeared to me in specific colors. The number 2 is baby pink, 3 is sunshine yellow, 4 is ...

Vladimir Nabokov first noticed, at age 7, his special gift of synesthesia when playing with colorful alphabet blocks that "were all the wrong color." Source: Contributor: Neil Overy/Alamy Stock Photo.