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.).