Most synesthetes report that their experiences are pleasant or neutral, although, in rare cases, synesthetes report that their experiences can lead to a degree of sensory overload. This involuntary and consistent nature helps define synesthesia as a real experience. The automatic and ineffable nature of a synesthetic experience means that the pairing may not seem out of the ordinary. Some synesthetes often report that they were unaware their experiences were unusual until they realized other people did not have them, while others report feeling as if they had been keeping a secret their entire lives. A more accurate but significantly less common term may be ideasthesia. Many different phenomena have been included in the term synesthesia (“union of the senses”), and in many cases the terminology seems to be inaccurate. Awareness of synesthetic perceptions varies from person to person.ĭifficulties have been recognized in adequately defining synesthesia. Only a few types of synesthesia have been scientifically evaluated.
These are usually the first abstract concepts that educational systems require children to learn. This hypothesis – referred to as semantic vacuum hypothesis – explains why the most common forms of synesthesia are grapheme-color, spatial sequence and number form. It has been suggested that synesthesia develops during childhood when children are intensively engaged with abstract concepts for the first time. Little is known about how synesthesia develops. Synesthetic associations can occur in any combination and any number of senses or cognitive pathways.
In spatial-sequence, or number form synesthesia, numbers, months of the year, or days of the week elicit precise locations in space (for example, 1980 may be “farther away” than 1990), or may appear as a three-dimensional map (clockwise or counterclockwise). In one common form of synesthesia, known as grapheme-color synesthesia or color-graphemic synesthesia, letters or numbers are perceived as inherently colored. People who report a lifelong history of such experiences are known as synesthetes. Synesthesia (also spelled synæsthesia or synaesthesia from the Ancient Greek σύν syn, “together”, and αἴσθησις aisthēsis, “sensation”) is a perceptual phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. Synesthetes see characters just as others do (in whichever color actually displayed) but may simultaneously perceive colors as associated with or evoked by each one. How someone with synesthesia might perceive certain letters and numbers.
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