Synesthesia is a condition where a stimulus in one sensory area triggers a sensation in another. Observed by Galton in the 19th century, it appears in about 4% of the population and is often hereditar...Synesthesia is a condition where a stimulus in one sensory area triggers a sensation in another. Observed by Galton in the 19th century, it appears in about 4% of the population and is often hereditary. Commonly, individuals experience colors associated with letters or sounds. The condition is stable over time for individuals, though different people may perceive different colors for the same stimuli. It can sometimes arise from sensory deprivation, leading to cross-activation in the brain.
