Synaesthesia is a neurologically-based phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.
Most people with synaesthesia are not aware they are synaesthetes and feel certain about the way they perceive things: they think the way they experience the world is the way everyone experiences it. But, when they realize that something is not quite "right," they become disappointed or afraid – many hide it or pretend to perceive as others around them do – "faking it."
The research field has grown from grapheme-color synaesthesia to include other forms of synaesthesia in which flavors are evoked by music or words (lexical-gustatory synaesthesia), space structures by time units, colors by music, etc.
Surprising as it may seem, there are people who can smell sounds, see smells, or hear colors. Actually, all of us at some point in our lives have had this ability – some authors affirm that it is common in newborns.
In the department of Experimental Psychology and Physiology at the University of Granada, a research group is carrying out pioneer work in Spain on the systematic study of synaesthesia and its relation with perception and emotions. Professor Juan Lupiáñez Castillo and Alicia Callejas Sevilla have devoted many years to the study of this unknown but interesting phenomenon, which affects approximately one person out of every thousand. Many of these people do not even know that they are synaesthetes, as they think they perceive the world normally.
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