This book explores the fascinating area of interpersonal coordination in force production tasks, outlining the author's extensive research to date and presenting stimulating new perspectives. The purpose is to provide a detailed exposition of current understanding of the science behind interpersonal joint action. Readers will find clear explanation of concepts from social cognition and neuroscience that are key to an understanding of the field, including the social brain hypothesis, the mirror neuron system, and joint action, as well as other relevant background information. The author then proceeds to present an overview of recent original studies on interpersonal movement coordination performed at his laboratory in Japan. These studies provide insights into such issues as complementary and synchronous force production in joint action, bidirectional transfer between joint and solo actions, and motor control hierarchy in joint action involving bimanual force. They also set the direction for integration of knowledge of physical properties and social cognition. The book will be of interest for researchers and graduate students in all areas of the biomedical sciences.

1 Introduction.- References.- 2 The background of the study on interpersonal coordination.- 2.1 The social brain.- 2.2 The motor cortex and its relation to social behavior.- 2.3 The social function of the mirror neuron system.- 2.4 Imitation, mimicry, and its relation to social behavior.- 2.5 Joint perception.- 2.6 Observational motor learning.- 2.7 The effect of action expertise on shared representation.- 2.8 The effect of motor expertise on observational learning in sports.- 2.9 The effect of shared representation on team sports.- 2.10 The effect of shared representation on musical ensemble performance.- References.- 3 An overview of the study on interpersonal coordination.- 3.1 Unintentional interpersonal entrainment.- 3.2 Intentional interpersonal coordination.- 3.3 Development of interpersonal coordination.- References.- 4 Complementary and synchronous force production in joint action.- 4.1 Two heads are better than one.- 4.2 Is there social loafing in joint action that consists of four people?.- 4.3 A leader-follower relationship in joint action.- 4.4 Effects of speech on joint action.- 4.5 Load perturbation facilitates interpersonal error compensation during joint action.- References.- 5 Is there bidirectional transfer between joint and solo actions?.- References.- 6 Motor control hierarchy in joint action that involves bimanual action.- References.- 7 Conclusion.- References.- Acknowledgement.