Synaesthesia – The Mixing of the Senses: How Some Join Their Senses to Experience the World in a New Way


What colour is the number 4 or what shape is August? Can you taste a prelude by Bach or describe the texture of the letter B? For the overwhelming majority the answer to these questions is no, but not for those who experience synaesthesia.

What Is Synaesthesia?

The UK Synaesthesia Association describes the condition as a joining of the senses. Sensations in one modality, for example hearing, produce sensations in another, for example colour.

Synaesthesia is when you can hear the color or so on – image by

The History of Synaesthesia

Professor Simon Baron Cohen says that synaesthesia has enjoyed a renaissance over the last twenty years. A common topic of research in the late 19th and early 20th centuries, interest diminished until the mid 1980’s. Professor Cohen notes that some suggest this could have been due to the rise of Behaviourism, which held little store for the self-reporting of mental experience.

synaesthesia a scaled
Synaesthesia has enjoyed a renaissance over the last twenty years – image by

Professor Cohen and Maria Wyke presented the case of a female painter with the condition in the publication Perception in 1987. Seeking to confirm the experience as consistent, they studied the subject for a year during which she remained stable and undeviating.

Subsequent neuroimaging has indicated that although blindfolded, synaesthetes show visual activity in the brain when listening to sound.

Synaesthetes show visual activity in the brain when listening to sound – image by

Current studies are seeking a gene for synaesthesia, which Professor Cohen says would be the ultimate proof of genuineness.

What Is it Like to Experience Synaesthesia?

Shared experience is a bond that unites and descriptive language is precisely that, it describes what is commonly apparent. However, what is made of somebody who says the letter O is white?

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Do you see that letter O is white? – image by

The Synaesthesia Association quotes Pat Duffy.

“Other people don’t see what we see and they’re not convinced we see it ourselves. But what each of us see is the reality we know. I am at no more liberty to change the white colour of the letter O than I am to change its circular shape: for me, the one is as much an attribute of the letter as the other.”

synesthesia with music
Can you see the music? – image by

The expression of synaesthesia is distinct to the individual concerned. Someone suffering from toothache can observe the colour of pain or a course of acupuncture can present a kaleidoscope of movement, colour or texture.

Creativity and Synaesthesia

Understandably, some can find the experience inspiring to their creative output, examples being painter David Hockney, composer Olivier Messiaen, writer Vladimir Nabokov, philosopher Ludwig Wittgenstein, and physicist Richard Feynman.

nichols canyon painting david hockney portrait
Painter David Hockney – image by

A study undertaken by the synaesthesia research group at the University of Sussex in the UK examined the link between the condition, art and creativity. They found that synaesthetes were more likely to report art and music as a hobby or occupation.

The effect for a particular subtype of synaesthesia – visualised music – was found to be particularly pronounced with the group suggesting this is due to the experience being aesthetically pleasing and rich in detail.

Synaesthesia - The Mixing of the Senses: How Some Join Their Senses to Experience the World in a New Way
Visualized music – image by

The overall conclusion from the study was that while synaesthesia may have beneficial aspects for creativity, such as linking disparate meanings, evidence was not found that those experiencing the condition were more successful at generating novel ideas.

Future Study of Synaesthesia

With neuroimaging providing physical confirmation of brain activity and connectivity in synaesthetes, future study of this condition seems assured. The seemingly illogical but apparently real connections experienced provide intriguing insights into the working of the human mind.


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