This book presents a thorough and up—to—date review of the scientific literature on behavioural synchronization and its underlying neurocognitive and neurophysiological processes, from the neuronal to the interindividual and group scale. This multi—disciplinary and multi—scale approach makes this book of interest to scientists and graduate students for both theoretical issues as well practical issues such as mobilizing animals and humans for group / mass actions (e.g. for climate change, diabetes, leading animals, etc.).