Synesthesia (also spelt Synaesthesia) is a neurological trait in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People who report such experiences are known as synesthetes.
Synaesthesia can occur between nearly any two out of five senses. There are approximately sixty different types of documented Synaesthesia. Some are more common than others.
Many synaesthetes report having one or more close relatives who also have synaesthesia. Most synaesthetes experience synaesthesia through their mind’s eyes (called “associator”) whilst a very small number of people are “projectors” whose synaesthesia seems to be projected out into the world.
Many of us do not know that we perceive the world differently until well into the adulthood. Due to the increased awareness and ongoing research last three decades, more and more synaesthetes start discovering their rare perception from a much younger age.
Some people do not believe Synaesthesia provides an individual any evolutionary advantage. However, having extraordinary memory and being unusually creative appear to be common traits amongst synaesthetes. Many of them also possess a high ability of synthesising information.