Abstract: The brain sciences are providing new means of investigating brain processes involved in decision making. However, our ability to understand decision-making at the computational level requires methods unsuitable for use in humans. Here I argue that monkeys are attractive models of human decision-making, and that neurophysiological recordings in monkeys can provide insight into human decision processes. I explore a number of objections to the relevance of monkey data to understanding human decision-making, including the importance of language and consciousness, and argue that none undermines the applicability of the model, though some may limit it. Finally, I'll briefly address the relevance of studies of decision in monkeys to questions of free will.