Synesthesia: when your senses mix together

Imagine hearing music and seeing colours at the same time—or tasting a flavour when you hear a word. For people with synesthesia, this isn’t imagination or metaphor. It’s a real, automatic experience.

Synesthesia (pronounced sin-ess-thee-zee-ah) simply means that the brain links senses together in a different way.

What does synesthesia feel like?

Everyone’s experience is a bit different, but some common examples include:

• Letters or numbers having specific colours (e.g. “A is red, 5 is green”)

• Music creating colours, shapes, or movement

• Words having tastes or textures

• Days of the week appearing in a mental “map”

These experiences are:

• Automatic (you don’t choose them)

• Consistent (they stay the same over time)

• Normal for the person experiencing them

Why does this happen?

There’s no single answer, but the main idea is simple:

The brain areas for different senses are more connected than usual

In most people, senses are kept fairly separate. In synesthesia, those boundaries are a bit more “blended,” so information spills across.

It may also:

• Run in families

• Be linked to how the brain develops in early childhood

It’s not caused by anything going wrong—it’s just a different wiring style.

Is synesthesia linked to autism?

This is a really common question.

Having synesthesia does NOT mean someone is autistic.

However:

• Synesthesia is more common in autistic people

• They can share some traits, especially around sensory experiences

For example, both may involve:

• Strong sensory awareness

• Noticing patterns others might miss

• Feeling overwhelmed in busy environments

But many people with synesthesia are not autistic, and many autistic people do not have synesthesia.

What are the benefits?

Many people see synesthesia as a strength.

Better memory

Colours or sensory links can make things easier to remember (like numbers, names, or dates)

Creativity

It’s quite common in artists, musicians, and writers

Unique thinking

People often describe rich imagination and strong pattern recognition

Are there any downsides?

For some people, yes—especially if they are already sensitive to sensory input.

 Sensory overload

Extra sensory experiences can make busy places feel overwhelming

Difficulty focusing

If multiple senses are firing at once, it can be distracting

 Feeling misunderstood

Others may not “get it,” especially if they’ve never heard of synesthesia

How do you know if you have synesthesia?

There isn’t a formal medical diagnosis, but there are simple ways to explore it.

The key feature is consistency over time.

For example:

• If “Monday is blue” for you, it will always be blue

• If “7 is yellow,” that won’t change randomly

You can try:

• Online tests like the Synesthesia Battery

• Keeping track of your experiences over time

How does synesthesia fit with neurodiversity?

Synesthesia is often talked about alongside things like:

• Autism

• ADHD

• Sensory processing differences

All of these are part of neurodiversity—the idea that brains naturally work in different ways.

Rather than being a problem, synesthesia is usually seen as: A different way of experiencing the world

Final thoughts

For many people, synesthesia adds colour, texture, and richness to everyday life. It can make memories stronger, creativity deeper, and thinking more connected.

For others, it can feel overwhelming at times—especially in a busy, sensory-heavy world.

But overall, it’s not something that needs to be “fixed.”It’s simply one of the many ways human brains can be beautifully different.