Did you see that? Did you hear that? Did you see AND hear that? If you answered "yes" to all three of those questions when exposed to a flash of light, you're one of a little over 20 percent of all humans with a form of synesthesia that allows them to hear faint sounds when seeing flashes of light or silent visual movements. A lot of us go around having senses that we do not even recognize. In just the second study ever published on this phenomenon, the journal Consciousness and Cognition reveals the results of tests led by cognitive neuroscientist Elliot Freeman and conducted by researchers at City, University of London, on 40 subjects to determine if they had this mild form of synesthesia – the neurological condition in which stimulation in one sense leads to an involuntary experience in a second sense. In the first part of the test, the participants were exposed to pairs of sequences of dots-and-dashes and short-and-long sounds (similar to Morse code) and asked to confirm if the