They're wired differently!

Fred Himebaugh should feel vindicated in his disdain for people with synaethesia. Mind Hacks reports on a study that shows through brain imaging how synaesthetes have more connections in the fusiform gyrus. So essentially the white matter of synaesthetes brains are wired differently. Not only that, but different forms of synaesthesia reveal different forms of wiring. The article cited, from Neurophilosopher, also describes the different form of brain imaging, DTI, which measures water molecule diffusion. It's fascinating what scientists can come up with.