Have you ever tasted a word, or seen colours while listening to music?

If you have, you may be among the 1% to 4% of people who have a fascinating trait known as synaesthesia.

Synaesthesia is a neurological phenomenon where the activation of one sense, such as hearing, triggers the activation of another usually unrelated sense, such as sight. This means people with synaesthesia often experience additional sensations compared to the rest of us.

We’ve devoted a lot of time to understanding this rare phenomenon. While there’s much more to unpack, what we do know shows we don’t all perceive the world in the same way.

What is synaesthesia?

People with synaesthesia are known as synaesthetes. Research suggests synaesthesia may be more common among women, although this could reflect sampling biases, and may be influenced by genetics.

There are many different types of synaesthesia. Some people have auditory-visual synaesthesia, meaning they see colours when they hear sounds. Others see colours when they read, hear or think about letters or numbers. This is known as grapheme-colour synaesthesia. Another example is mirror-touch synaesthesia, where a person feels sensations on their own body when they see another person being........

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