a single nucleotide change in the sequence of one's DNA alters perception

The amazing thing is that a single nucleotide change in the sequence of one's DNA alters perception.In this way, synesthesia provides a path to understanding subjective differences,how two people can see the same thing differently.Take Sean, who prefers blue tasting food,such as milk, oranges, and spinach.The gene heightens normally occurring connections between the taste area in his frontal lobe and the color area further back.But suppose in someone else that the gene acted in non-sensory areas.You would then have the ability to link seemingly unrelated things,which is the definition of metaphor,seeing the similar in the dissimilar.