Danica Patrick

Danica Patrick and the dopamine effect? "It's a good bet she inherited her need for speed," says neurologist Malcolm Stewart, medical director of the Human Performance Lab at Presbyterian Hospital of Dallas. "She probably comes from a family of high dopamine producers." Dopamine is a brain chemical that acts as a messenger involved in reward, motivation and mood. People with high dopamine production tend to be risk-takers such as race car drivers, bungee jumpers, test pilots, astronauts and explorers, Stewart says."They ride motorcycles fast, get tattoos."

Want to find out some more about Danica Patrick's tattoo designs?
Check out: Flag tattoos, Angels, Wings, Stars