I’ve been working through Jonah Lehrer’s How We Decide, a really fine book that explores the neuroscience behind how we make decisions. In one of the early chapters, Lehrer describes the role dopamine neurons play in decision-making. Essentially, they are those elements of the brain that register experience and create emotions. Interestingly, these neurons actually learn from experience. That is, they take note of successes and failures and improve their predictive performance (creating an emotion before something actually occurs – pleasure at the sight of an ice cream cone, anxiety when noticing that the back door to the house is...