Synesthesia (or synaesthesia British spelling) is a phenomenon in which stimulating one sense or thought automatically triggers another. For example, someone with synesthesia might see colors when they think of numbers, see shapes when they smell certain scents, or taste flavors when they read words.
The battery test shown in the video: https://synesthete.ircn.jp/home
To take the test you may wish to make an account → skip providing researcher's email → skip personal questions → select grapheme to color or other type of synesthesia → begin test. There is also a demo of the color picker available to play with on the site (not account needed).
Wednesday is Indigo Blue book: https://amzn.to/3NjfGN7
Thanks to my editor @BarknoorZ for sharing her experience!
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Editing by Noor Hanania
