I guess a simple way to do it would be to do an experiment
1. Read a list of random numbers between 0 and 9 at a rate of about one every 3 seconds. For example: 7, 9, 4, 0, 3, 8, 2, 5, 1, 6.
2. After each number is read, ask people to write down the number and what colour that they associate with each number.
3. Collect the answers. These will be called “Answers #1”.
4. Two to three weeks later, repeat the experiment, but change the order of the numbers. For example: 3, 6, 5, 9, 4, 1, 7, 0, 5, 2, 8.
5. Collect the answers. These will be called “Answers #2”.
6. Compare Answers #1 with Answers #2. A person with synesthesia will have all or most of the same number-colour pairs on both Answers #1 and Answers #2.
This experiment can also be done using letters instead of numbers.
I think you’d have to consult a specialist (referred by your doctor) – but you would have lots of clues presumably, if you can “smell” colours, “see” sounds etc.?
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