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  • Title: Exploring the relationship between grapheme colour-picking consistency and mental imagery.
    Author: Spiller MJ, Harkry L, McCullagh F, Thoma V, Jonas C.
    Journal: Philos Trans R Soc Lond B Biol Sci; 2019 Dec 09; 374(1787):20190023. PubMed ID: 31630654.
    Abstract:
    Previous research has indicated a potential link between mental imagery and synaesthesia. However, these findings are mainly based on imagery self-report measures and recruitment of self-selected synaesthetes. To avoid issues of self-selection and demand effects, we recruited participants from the general population, rather than synaesthetes specifically, and used colour-picking consistency tests for letters and numbers to assess a 'synaesthete-like' experience. Mental imagery ability and mental rotation ability were assessed using both self-report measures and behavioural assessments. Consistency in colour-picking for letters (but not numbers) was predicted by performance on the visual mental imagery task but not by a mental rotation task or self-report measures. Using the consistency score as a proxy measure of grapheme-colour synaesthesia, we provide more evidence for the suggestion that synaesthetic experience is associated with enhanced mental imagery, even when participants are naive to the research topic. This article is part of a discussion meeting issue 'Bridging senses: novel insights from synaesthesia'.
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