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Key Points: Synaesthesia (Taste words, hear colours)
What it is
Synaesthesia = stimulation of one sense automatically triggers another (e.g., sounds → colours).
Occurs in about 1%–4% of people.
Experiences are automatic, consistent, and vivid.
Not a disorder; usually doesn’t interfere with daily life.
Common types
Auditory–visual: hearing sounds → seeing colours
Grapheme–colour: letters/numbers → specific colours
Mirror-touch: seeing someone touched → feeling it on your own body
Key characteristics
People don’t control the sensations
Associations stay stable over time (e.g., “A” always red)
Many people don’t realise they have it
Can occasionally be overwhelming (e.g., feeling others’ pain)
What causes synaesthesia? (Two main theories)
1. Cross-activation theory (extra connections)
More connections between sensory brain areas
Linked to reduced synaptic pruning during development
Example: letter-recognition area directly linked to colour area
2. Disinhibited/stronger activity theory
Same connections as everyone else
But pathways are stronger or more active
Brain activates colour associations automatically
Big debate:
Different brain wiring vs different brain activity patterns
Is it linked to creativity?
More common in creative professions
Survey: ~24% of synaesthetes in creative jobs vs <2% general population
Possible reasons:
Unusual sensory associations
Stronger imagination
More vivid memory (limited evidence)
Big takeaway
Synaesthesia shows perception isn’t the same for everyone
The brain actively constructs reality
Some people literally experience a richer, cross-sensory world
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