The third book in Young's unique trilogy on causality and development continues to locate and define the central role of causality in biopsychosocial and network/systems development, and as a unifying concept of psychology itself. As a way of discussing causality, in general, initially, the book focuses on the acquisition of handedness and hemispheric specialization in infancy and childhood, and their relations to the development of cognition, language, and emotion, in particular. The second part of the book elaborates an innovative 25-step Neo-Eriksonian model of development across the life course based on a Neo-Piagetian model covered in the previous books, completing a step-by-step account of development over the lifespan cognitively and socio-emotionally. It builds on the concept of neo-stage, which is network-based. From this conceptual synthesis, the author's robust theory of development and causality identifies potential areas for psychological problems and pathology at each developmental step as well as science-based possibilities for their treatment.

Introduction.- Part I: Causality: Development of Evolution of Handedness, Manual Specialization, and Hemispheric Specialization: Activation-Inhibition Coordination Model.- Introducing Laterality.- Developmental Laterality Research: Infancy.- Developmental Laterality Research: Childhood.- Other Human Laterality Research.- Multifactorial Causality in Laterality.- Animal Laterality Research.- Standard Laterality Models.- New Laterality Models.- Part II: Development: A 25-step Neo-Piagetian/Neo-Eriksonian Model: Elaborating the Neo-Eriksonian Model and Therapeutic Practice.- Stage and Sub-Stage Models.- Neo-Models, Neo-Stages, Networks.- Introducing the 25-Step Neo-Eriksonian Model.- The Reflex-Based Sub-Stages: Non-Participatory Reflexive Socio-Emotions.- The Sensori-motor-Based Sub-Stages: Pre-Participatory Socio-Affects.- The Peri-Operational-Based Sub-Stages: Peri-Participatory Social Cognition.- The Abstract (Formal Operational) Sub-Stages: Hyper-Participatory Social Mutuality.- The Post-Formal/Collective Intelligence (Super-ordinate Abstract) Sub-Stages: Super-Ordinate Participatory Collective Sociality.- Book Conclusions.- Appendices.