number-form synaesthesia
   A term used to denote a type of * synaesthesia characterized by the automatic and involuntary appearance of a mental map or configuration of numbers whenever one thinks of numbers. These maps or configurations, referred to as * number forms, can in some individuals gain the perceptual quality of full-blown hallucinations. The * cross-activation hypothesis suggests that number-form synaesthesia is mediated by 'crosstalk' between regions of the parietal lobe that are involved in numerical cognition and spatial cognition.
   References
   Seron, X., Pesenti, M., Noël, M.-P. (1992). Images of numbers, or When 98 is upper left and 6 sky blue. Cognition, 44, 159-196.

Dictionary of Hallucinations. . 2010.

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