In a nutshell
In some people, letters, numbers, or sounds automatically trigger additional color experiences. The associations are often relatively stable over long periods but differ from person to person.
Why does it happen?
Synesthesia links a particular trigger with an additional conscious experience. Unusual connections and altered feedback between processing networks are being investigated as explanations. The mechanisms may vary by form; no single universal wiring pattern has been established.
Frequency
Synesthesia occurs in a portion of the population. Estimates depend heavily on which forms are included and how the consistency of associations is tested.
Frequency is a qualitative description, not your individual probability.
Is it normal?
Synesthesia that has been stable since childhood is usually harmless.
When to seek advice
Suddenly new additional sensory experiences, especially after a medication change or together with other symptoms, should be discussed with a clinician.
Does this happen to you?
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Sources (1)
- Synesthesia: an introduction (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
