In this interview-based episode, Dr. Marsh explains the centrality of fear in human behavior, which motivates any social species (whether musk ox or democrats or republicans) to cluster together against perceived threats. The unfortunate result is the formation of tribes, demonization of others, and the filtering of information leading to stark, unhealthy divisions. In Part I of the interview, staff reporter Emily Crocetti queries Dr. Marsh on how the US became so partisan. In response, Dr. Marsh emphasizes the importance of social situations in determining emotions and behavior. And she points to the substantial sorting of US citizens along political lines in recent decades as a major factor. In Part II, Dr. Marsh discusses methods by which Americans might become less partisan, pointing to seminal psychology studies and methods used in her own classes. Here, students with opposing viewpoints are guided through civil discussions on hot topics of the day. In Part III, Dr. Marsh emphasizes she is not a political scientist yet offers great insights into whether independent-minded Americans can help bridge the political divide. She proposes that independents are better able to deal with the cognitive complexity of different life experiences and viewpoints. As a result, independents might be able to have the sensitive, trust-based conversations on political issues sorely lacking in the US today. Original music composed and created by Ryan Adair Rooney. For show notes and transcript, please visit our website: www.fluentknowledge.com/shows/the-purple-principle/heard-from-the-herd-psychology-and-partisanship-featuring-dr-abigail-marsh-author-of-the-fear-factor-professor-of-psychology-neuroscience-georgetown-university