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[Editor's note: Synesthesia is "a neurological phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway."]

AnonTechie writes:

Nothing could be more intensely subjective or taken-for-granted than the ineffable way that each of us perceives the world. This is why many synaesthetes go through a lifetime without realising that their everyday sense experience is exceptional or strange. Those who do, report a moment of startled self-awareness when friends respond with an uncomprehending: ‘What do you mean, my name tastes of split-pea soup?’ Such eureka moments have grown increasingly common since the 1980s, when cognitive tests were first developed to judge the authenticity of the reports through to the mid-1990s, when brain scans and brain-wave measurements began tracking the physiology of synaesthesia’s various forms.

Writing in The Oxford Handbook of Synesthesia in 2013, Richard Cytowic, a neurologist and synaesthesia researcher at George Washington University, describes the ‘astonishment and enthusiasm’ reported by synaesthetes after tests validated that they weren’t ‘making it all up’.

http://aeon.co/magazine/psychology/are-we-all-born-with-synaesthesia/