Synaesthesia is a neurological phenomenon where one sensory experience triggers another, affecting an estimated 2 to 4 percent of the global population. For synaesthetes like jewellery designer Constantina Makridakis, names have distinct flavors—her father’s name tastes like caramel-coated chocolate, while the American accent evokes Coca-Cola. Neuroscientists suggest these cross-sensory connections may result from reduced synaptic pruning during childhood, leaving extra neural pathways intact. This article explores the science behind synaesthesia, its impact on daily life, and what it reveals about the diversity of human perception.
The Hidden World of Synaesthesia
Imagine hearing a name and instantly tasting caramel-coated chocolate or listening to a voice that triggers the flavor of melted cheddar cheese. For Constantina Makridakis, a 28-year-old jewellery designer from Greece, these sensory overlaps are not figments of imagination but everyday realities. Makridakis is a synaesthete—a person who experiences synaesthesia, a condition where stimulation of one sensory pathway involuntarily activates another. Her father’s name, Nicholas, tastes like rich chocolate, while her mother’s name, Maria, evokes the flavor of prawn pasta. For years, she assumed everyone shared this ability.
"I thought it was completely normal," Makridakis explained. "We speak from our mouths, so it made sense that names and voices would also have tastes. It wasn’t until my late teens, when my sister mentioned a documentary about synaesthesia, that I realized my experiences were unique." Her sister’s name, Amelia, tastes sweet, often resembling syrup or jam. The revelation reshaped Makridakis’s understanding of perception and led her to explore the science behind her condition.
How Common Is Synaesthesia?
Synaesthesia is far more widespread than many realize. According to Janina Neufeld, a researcher at the Centre of Neurodevelopmental Disorders at Karolinska Institutet (KIND) in Sweden, an estimated 2 to 4 percent of the global population experiences some form of synaesthesia. However, Neufeld cautions that the true prevalence may be higher, as many synaesthetes remain unaware of their condition. "Most people don’t realize they have it," Neufeld said. "They assume everyone perceives the world the same way."
The condition manifests in various forms. For instance, American singer-songwriter Billie Eilish perceives days of the week as distinct colors, numbers, and shapes. Hungarian composer Franz Liszt, who lived in the 19th century, reportedly saw musical notes as colors—a phenomenon that occasionally left his orchestra members bewildered. During a rehearsal in 1842, Liszt famously instructed his musicians to play a passage "a little bluer," a request that likely puzzled those unfamiliar with his synaesthetic experiences.
Neufeld, who herself experiences a milder form of spatial sequence synaesthesia, describes her perception of time as a circular, undulating path. "In my mind, the year forms a circle that starts at the bottom and moves counterclockwise," she explained. "Some months, like December, feel longer than others, almost as if they occupy more space on this mental roller coaster." Her experience highlights how synaesthesia can subtly shape even the most mundane aspects of life.
The Neuroscience Behind Cross-Sensory Connections
While the exact mechanisms of synaesthesia remain under investigation, researchers have developed compelling theories about its origins. One leading hypothesis suggests that synaesthetes may undergo less "synaptic pruning" during childhood—a natural process where the brain eliminates weaker neural connections to strengthen more essential ones. For most people, this pruning helps streamline sensory processing, reinforcing connections tied to familiar stimuli, such as a parent’s voice, while discarding those linked to less relevant inputs.
"In synaesthetes, this pruning process may be less extensive," Neufeld explained. "This allows cross-sensory connections to persist, creating the unique associations they experience." Studies using brain imaging have supported this theory, revealing heightened activation in sensory regions and increased communication between different areas of the brain in synaesthetes. These findings suggest that synaesthesia is not merely a quirk of perception but a tangible difference in neural wiring.
Living with Synaesthesia: Challenges and Insights
For Makridakis, synaesthesia is a double-edged sword. While it enriches her sensory experiences, it can also be overwhelming. "If I’m watching a film and an actor’s voice tastes like orange juice, I can get distracted by that connection," she said. "It’s like having an extra layer of perception that others don’t experience." Her synaesthesia also influences her cravings. The American accent, which she associates with the taste of Coca-Cola, often leaves her yearning for the sugary drink when she visits the United States. Similarly, the voice of former U.S. President Donald Trump evokes the flavor of melted cheddar cheese, while British actor Daniel Radcliffe’s voice tastes like chocolate milk.
Despite these challenges, Makridakis views her synaesthesia as a source of fascination. "It’s given me a deeper appreciation for how differently we all perceive the world," she said. "We might all agree that a color is red, but what we ‘see’—or taste, or hear—can be entirely unique." Neufeld echoes this sentiment, emphasizing that synaesthesia underscores the richness of human perception. "We often assume that everyone experiences the world similarly," Neufeld said. "But synaesthesia shows us that sensory inputs are just the beginning. Our internal associations and experiences add layers of complexity that we’re only beginning to understand."
Could Synaesthesia Hold Spiritual or Creative Significance?
Makridakis has occasionally wondered whether her synaesthesia carries a deeper, perhaps spiritual, meaning. Beyond tasting names and voices, she sometimes perceives colors shimmering around people—a phenomenon she describes as a "halo." Her sister, for example, occasionally appears surrounded by a dark green aura. While these experiences remain unexplained by science, they fuel Makridakis’s curiosity about the potential connections between synaesthesia and creativity or intuition.
Neufeld notes that synaesthesia has long been associated with artistic expression. Many renowned artists, musicians, and writers—including Vladimir Nabokov, Wassily Kandinsky, and Pharrell Williams—have reported synaesthetic experiences. "There’s a reason why so many creative individuals have synaesthesia," Neufeld said. "It may enhance their ability to draw connections between seemingly unrelated ideas or sensations, fostering innovation and originality."
Frequently Asked Questions About Synaesthesia
What is synaesthesia?
Synaesthesia is a neurological condition where stimulation of one sensory pathway involuntarily triggers another. For example, a synaesthete might perceive letters as colors, sounds as tastes, or numbers as spatial locations. These associations are consistent and automatic, meaning they do not change over time.
How many people have synaesthesia?
Research suggests that 2 to 4 percent of the global population experiences some form of synaesthesia. However, the true prevalence may be higher, as many synaesthetes are unaware of their condition and assume their perceptions are universal.
What causes synaesthesia?
While the exact cause remains unclear, one leading theory proposes that synaesthetes undergo less synaptic pruning during childhood. This process typically eliminates weaker neural connections, but in synaesthetes, cross-sensory pathways may persist, leading to the blending of senses.
Is synaesthesia a disorder?
Synaesthesia is not considered a disorder. Most synaesthetes view their condition as a unique aspect of their perception rather than a limitation. In fact, many synaesthetes report that their experiences enhance their creativity and appreciation of the world.
Can synaesthesia be developed or learned?
Synaesthesia is generally believed to be an innate condition, though some studies suggest that certain forms of training or sensory deprivation may temporarily induce synaesthetic-like experiences in non-synesthetes. However, these effects are typically short-lived and do not replicate the consistency of true synaesthesia.
Key Takeaways
- Synaesthesia affects an estimated 2 to 4 percent of the global population, though many synaesthetes remain unaware of their condition.
- The condition involves involuntary cross-sensory associations, such as perceiving names as flavors or music as colors.
- Neuroscientists believe synaesthesia may result from reduced synaptic pruning during childhood, leaving extra neural pathways intact.
- Synaesthesia is not a disorder and is often associated with enhanced creativity and unique perceptual experiences.
- Research into synaesthesia could deepen our understanding of human perception and the brain’s capacity for sensory integration.
Conclusion
Synaesthesia challenges our assumptions about how we perceive the world. For synaesthetes like Constantina Makridakis, everyday experiences are enriched by layers of sensory overlap that most people never encounter. As neuroscience continues to unravel the mysteries of this condition, it offers a glimpse into the remarkable diversity of human perception. Far from being a mere curiosity, synaesthesia underscores the idea that our minds are far more interconnected—and unique—than we often realize. Whether through the flavors of names or the colors of music, synaesthetes remind us that reality is not a one-size-fits-all experience but a deeply personal and multifaceted journey.
