The brain is primed to learn with a bias that is pegged to our freely chosen actions. Choice tips the balance of learning: for the same action and outcome, the brain learns differently and more quickly from free choices than forced ones. This skew may seem like a cognitive flaw, but in computer models, Stefano Palminteri’s team found that choice-confirmation bias offered an advantage: it produced stabler learning over a wide range of simulated conditions than unbiased learning did. So even if this tendency occasionally results in bad decisions or beliefs, in the long run, choice-confirmation bias may sensitize the brain to learn from the outcomes of chosen actions — which likely represent what is most important to a given person.