C1 Advanced Reading • Cambridge CPE Preparation
1. Are all senses completely separate, or could they be connected in some way?
2. When you eat something spicy, sometimes you feel heat. Is taste always confined to the mouth?
3. Have you ever made an unusual sensory connection, like finding a song "too yellow" or food "not sharp enough"?
4. Prediction: What could the title "When You Can Taste Colours" possibly mean?
Imagine tasting the letter D. For some people, this is reality. Synesthesia—a condition in which stimulation of one sensory pathway leads to automatic, involuntary experiences in another—reveals the hidden connections within our brains. A synesthete might taste specific flavours when reading certain words, see colours when hearing music, or experience texture when touching numbers. To the vast majority of people, these experiences seem impossible, even absurd. Yet synesthesia is neither hallucination nor imagination; it represents a genuine neurological difference in how sensory information is processed and integrated.
The neurological basis of synesthesia remains partially mysterious, but current evidence points to unusual connectivity patterns in the brain. Most brains maintain distinct sensory pathways—visual information stays visual, auditory information auditory. In synesthetes, these pathways appear to have additional cross-links, creating routes through which stimulation in one modality triggers activity in another. Brain imaging studies reveal that synesthetes display higher levels of neural connectivity in regions associated with multisensory integration. Remarkably, identical twins show high concordance rates for synesthesia, suggesting a strong genetic component. If one twin is a synesthete, the other is statistically very likely to be as well, pointing toward inherited neural architecture.
The relationship between synesthesia and creativity has long intrigued researchers. Numerous acclaimed artists, musicians, and writers report synesthetic experiences. Composer Igor Stravinsky famously associated specific colours with musical keys; he could not compose without seeing the colours triggered by harmonies. Franz Liszt, another renowned composer, reportedly said to his orchestra, "A little bluer, please!" when requesting a particular emotional quality from a musical passage. Many synesthetes working in creative fields report that their condition enhances their work, allowing them to perceive patterns and connections invisible to non-synesthetes. However, the causal relationship remains unclear: does synesthesia promote creativity, or does creativity emerge in people who already process sensory information unusually? The answer may be circular—the same neural architecture that enables synesthesia may also predispose individuals toward creative thinking.
Contrary to common assumption, synesthesia is not rare. Epidemiological estimates suggest that between 2 and 4 percent of the population experiences some form of synesthesia, making it more common than many people realise. Moreover, synesthesia appears to be more prevalent among women and in certain populations with higher rates of left-handedness. Variations exist: some synesthetes experience their associations as fixed and stable—always tasting orange when seeing the colour red—while others report more fluid, context-dependent associations. Some find their synesthesia advantageous, using it to enhance memory or creativity; others find it distracting or intrusive. Importantly, synesthesia cannot be acquired through training or practice; it appears to be fundamentally a trait one is born with, a hard-wired feature of neurological architecture.
Understanding synesthesia offers profound insights into perception and consciousness. It reveals that the boundaries between sensory systems are more fluid and permeable than traditional neuroscience once assumed. Synesthesia demonstrates that consciousness is not a unified phenomenon but an intricate tapestry of interconnected processing streams, each capable of influencing others. For synesthetes themselves, recognising their condition as neurologically grounded rather than pathological or imaginary has been transformative, validating experiences that mainstream science once dismissed as confusion or delusion.
A condition where stimulation in one sensory pathway triggers experiences in another.
A sensory system or mode of perception (vision, hearing, touch, etc.).
The state of being connected; in neuroscience, the links between different brain regions.
Agreement or similarity in traits or characteristics.
Relating to the study of disease frequency in populations.
Able to flow or change; not rigid or fixed.
Allowing substances or ideas to pass through; not completely separate.
Relating to disease or abnormal functioning; diseased.
A They are larger and contain more neural tissue.
B They have unusual cross-links between sensory pathways, creating connections that don't exist in non-synesthetes.
C They process only one sense at a time, not multiple senses simultaneously.
D They lack the ability to maintain distinct sensory pathways.
A Brain imaging studies show higher neural connectivity in synesthetes.
B Identical twins show high concordance rates, with both twins likely to be synesthetes if one is.
C Synesthesia is equally prevalent across all populations.
D Synesthesia can be acquired through practice and training.
A Proven definitively—synesthesia causes creative abilities.
B Clearly negative—synesthesia distracts creative work.
C Uncertain—it may be circular or bidirectional rather than purely causal.
D Irrelevant—synesthesia has nothing to do with creativity.
A Sensory systems are completely separate and do not interact.
B The senses can influence one another, challenging the idea that they are entirely independent.
C Human perception is unreliable and cannot be trusted.
D Only synesthetes can perceive multiple senses at once.
A It is extremely rare, affecting fewer than 0.5% of the population.
B It affects between 2 and 4 percent of the population, making it more common than many realise.
C It is almost universal, affecting most people at some point.
D The passage does not provide information about its prevalence.
A Synesthesia is a disorder that should be treated with medication.
B Understanding synesthesia proves that consciousness is composed of separate, independent systems.
C Synesthesia reveals that sensory systems interact and that recognising this neurologically grounds synesthetes' experiences.
D All human perception is synesthetic to some degree.
1. If synesthesia reveals that senses can be interconnected, what does this tell us about how we normally perceive the world?
2. The passage mentions that some synesthetes find their condition advantageous while others find it distracting. Why might the same condition affect different people differently?
3. Do you think synesthesia would be more common if all humans had the "right" neural connections? What determines whether a trait is rare or common?
4. The passage notes that synesthesia was once dismissed as delusion. How does recognising a condition as neurologically grounded change how we treat or view people with it?
5. Timed Writing (8 minutes): "If synesthesia reveals hidden connections in the brain, what other abilities or perceptions might humans have that we currently dismiss as impossible?"