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The Wiki page on Grapheme–color synesthesia says:

... one recent study has documented a case of synesthesia in which synesthetic associations could be traced back to colored refrigerator magnets.

Wiki points out that this might be an individual case, but let's assume that synesthesia is something you can train. Let's further assume that everybody is more or (most of us) less a synesthesist.

Can the level of synesthesia be measured by the following test:

  1. You are shown a sequence of colored characters, i.e. number and letters, or the characters shown are placed on a colored background.

  2. After that you are asked to give the sequence.

Should there be a measurable statistical effect in remembering the sequences when they are colored in your specific color scheme?

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Isn't this a question of the validity of a proposal for a test of whether synesthesia can be found to occur in varying degrees in people, even below the level of conscious awareness? I like the idea, but I don't think one needs to assume in advance that everyone is a synesthesist, let alone that it can be trained. –  Nick Stauner Jan 29 at 0:47
    
@nick if you don't need to assume your synesthety to provide an answer, go ahead... –  draks ... Jan 29 at 21:25
    
Sorry, no, I don't know enough about this to provide an answer; just hoped to help clarify a bit. My intuition is that you could do a test like this, and its outcome wouldn't require those prior assumptions. If I'm right, that would probably make the test even more interesting, because it might then help you test hypotheses about those ideas rather than require that you assume them a priori! Unfortunately, I can't really back that up. –  Nick Stauner Jan 29 at 21:31
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@nick let's see if there are experts around that can help. I thought about coding an app for my tablet to test myself. Any suggestions? –  draks ... Jan 29 at 21:47
    
I only suggest you make it compatible with Android 2+ so I can try it! :D –  Nick Stauner Jan 29 at 21:50

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