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A neat study from Dutch psychologists Olympia Colizoli , Jaap Murre and Romke Rouw claims that it's possible to train people to have something a bit like synaesthesia - which they call Pseudo-Synesthesia through Reading Books with Colored Letters. Synaesthesia generally comes out of the blue - some people just have it while others don't. Those who do experience it typically report that they've always had it. But could it be learned? Colizoli et al recruited 17 non- synaesthetes and got them to read books specially printed such that 4 common letters, "a", "e", "s" and "t", w e r e a lw a y s prin t e d in a c e r t a in colour: r e d, or a ng e , gr ee n or blu e .