It causes the brain to process data in several senses simultaneously. For example, people with synesthesia may hear sounds while seeing them as colourful swirls.
About 1 in 2,000 people experience synesthesia. The condition is more common in artists, writers and musicians. (about 20 to 25 percent of these professions have the condition.)
According to Psychology Today, over 60 types of synesthesia have been reported. The most common type is grapheme-colour synesthesia - when letters or numbers seem to be coloured on a page or visualised as coloured.
Other types include:
People with synesthesia often experience the following:
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