PROPENSITY TO LINK. “However, the specific form of synesthesia an individual expresses can vary within families, suggesting the genetic undertones impose a predisposition to synesthesia but not its expression. Indeed, individuals with one type of synesthesia are much more likely to have another as well, an observation that was adduced by Ramachandran and Hubbard as support for the idea that the defective pruning gene or genes confer a general propensity to linking unrelated sensations or even concepts.”
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