Different Forms Of Synesthesia

Francis Galton was the first to notice that Synesthesia seemed to run in the family. This observation lead to the fact that due to the selective expression of the synesthetic gene, the gene could give rise to anatomical specificity, which thereby lead to three propositions. One, the gene for Synesthesia could be present anywhere in the brain, thus explaining the different forms of Synesthesia. Two, the gene could occur in multiple regions of the brain, explaining why majority of synesthetes have more than one form of it. And lastly, it explained why different forms of synesthesia were found within a family.