Valentina Niccolai, Edmund Wascher and Petra Stoerig Distinct neural processes in grapheme–colour synaesthetes and semantic controls European Journal of Neuroscience 36
Whereas synaesthetes show congruency modulation of the N170 component, controls do not. This suggests that early sensory processing distinguishes crossmodal synaesthetic from acquired associations. Both early- and late-stage cognitive components are involved in bidirectional synaesthesia. Similar binding mechanisms appear therefore to subtend the processing of opposite flow directions of information (grapheme-colour, colour-grapheme).
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