What is the relationship between synaesthesia and visuo-spatial number forms?

@article{Sagiv2006WhatIT,
  title={What is the relationship between synaesthesia and visuo-spatial number forms?},
  author={Noam Sagiv and Julia Simner and James Collins and Brian Butterworth and Jamie Ward},
  journal={Cognition},
  year={2006},
  volume={101},
  pages={114-128}
}

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