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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Isolating automatic photism generation from strategic photism use in grapheme-colour synaesthesia.
Consciousness and Cognition 2017 November
Grapheme-colour synaesthesia is a phenomenon in which ordinary black numbers and letters (graphemes) trigger the experience of highly specific colours (photisms). The Synaesthetic Stroop task has been used to demonstrate that graphemes trigger photisms automatically. In the standard Stroop task, congruent trial probability (CTP) has been manipulated to isolate effects of automaticity from higher-order strategic effects, with larger Stroop effects at high CTP attributed to participants strategically attending to the stimulus word to facilitate responding, and smaller Stroop effects at low CTP reflecting automatic word processing. Here we apply this logic for the first time to the Synaesthetic Stroop task. At high CTP we showed larger Stroop effects due to synaesthetes using their synaesthetic colours strategically. At low CTP Stroop effects were reduced but were still significant. We directly isolate automatic processing of graphemes from strategic effects and conclusively show that, in synaesthesia, viewing black graphemes automatically triggers colour experiences.
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