Smarter than humans: rationality reflected in primate neuronal reward signals

Rational choice, in all its definitions by various disciplines, allows agents to maximize utility. Formal axioms and simple choice designs are suitable for assessing rationality monkeys. Their economic preferences complete transitive. In this paper I will describe how neuronal reward signals demonstrate a propensity rational choice. Dopamine follow transitivity satisfy first-order stochastic dominance that defines the better option. Neurons orbitofrontal cortex reflect unchanged when dominated option is removed from set, thus satisfying Independence of Irrelevant Alternatives (IIA). While monkeys, with their neurons, may not be more than humans, constraints controlled experiments seem allow them behave rationally within informational, cognitive temporal bounds.