Journal article

The ups and downs (and lefts and rights) of synaesthetic number forms: Validation from spatial cueing and SNARC-type tasks

Michelle Jarick, Mike J Dixon, Emily C Maxwell, Michael ER Nicholls, Daniel Smilek



Typically, numbers are spatially represented using a mental 'number line' running from left to right. Individuals with number-form synaesthesia experience numbers as occupying specific spatial coordinates that are much more complex than a typical number line. Two synaesthetes (L and B) describe experiencing the numbers 1 through 10 running vertically from bottom to top, 10-20 horizontally from left to right, 21-40 from right to left, etc. We investigated whether their number forms could bias their spatial attention using a cueing paradigm and a SNARC-type task. In both experiments, the synaesthetes' responses confirmed their synaesthetic number forms. When making odd-even judgments for the n..

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Funding Acknowledgements

This research was supported by the Natural Sciences and Engineering Research Council of Canada, with a grant to M.J.D. and D.S., and a Postgraduate Scholarship to M.J. We wish to sincerely thank the synaesthetes who made this research possible. We also extend our appreciation to Edward Hubbard for providing helpful comments on a previous version of the manuscript.