Strategic Instincts : Princeton University Press : 9780691137452 : 0691137455 : 29 Sep 2020 : "At the heart of much work in international relations is the attempt to understand why citizens and leaders act as they do-and over the last decade, a growing body of research has shown that the "rational choice theory" that has long guided this understanding is insufficient. People do not always behave rationally; instead, most of us have psychological biases that cause us to behave "irrationally." As political science has integrated this new behavioral research, the literature has tended to view such biases as source of errors or mistakes. Yet for other fields-most notably evolutionary biology-the same psychological biases are recognized as adaptive heuristics that evolved to improve our decision-making, not to undermine it. In this book, Johnson uses his cross-disciplinary training to push this evolutionary understanding of biases into the study of politics. Specifically, he asks: when and