It turns out that dopamine is a chemical on double duty in the brain. Along with its role in motor commands, it also serves as the main messenger in the reward systems, guiding a person toward food, drink, mates, and all things useful for survival. Because of its role in the reward system, imbalances in dopamine can trigger gambling, overeating, and drug addiction - behaviors that result from a reward system gone awry.
David EaglemanWe are not the ones driving the boat of our behavior, at least not nearly as much as we believe.
David EaglemanOur internal life and external actions are steered by biological coctails to which we have neither immediate access nor direct acquaintance.
David EaglemanBecause vision appears so effortless, we are like fish challenged to understand water.
David Eagleman