Synesthesia is a neurological condition where one sensory experience gets combined with another, meaning someone might hear sounds when they eat, or see colors when they listen to music. So what exactly is synesthesia? And what’s it like to go through life with these unique sensory connections? Featuring the voices of neuroscientist Dr. Richard Cytowic and five people with synesthesia.

Follow the show on Twitter, Facebook, & Reddit.Become a monthly contributor at 20k.org/donate.If you know what this week's mystery sound is, tell us at mystery.20k.org.To get your 20K referral link and earn rewards, visit 20k.org/refer.Get your first month of hair loss treatment for free at keeps.com/20k.Check out Dr. Richard Cytowic’s work at cytowic.net.Check out Joel Salinas's book Mirror Touch: A Memoir of Synesthesia and the Secret Life of the Brain.Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/synesthesiaLearn more about your ad choices. Visit megaphone.fm/adchoices