Once it was established that the 7R allele of the DRD4 gene was related to how far a population migrated, the next question was why? How did the 7R allele become more common in far-flung populations? The obvious answer is that dopamine makes people seek out more. It makes them restless and dissatisfied. It makes them long for something better. These are exactly the kinds of people who would leave an established community to go out and explore the unknown.
