ABSTRACT
Chapter 5 focuses on the extensive presentation of the main scientific views regarding the etiology of ADHD, based on genetic, neuroimaging, neurophysiological, and neurochemical studies. For this purpose, it reviews the most important findings on genetic, neurobiological, and environmental factors that interact in complex and dynamic ways, and contribute to the phenotypic occurrence of the disorder. This chapter also seeks to explain the pathway through which all these factors lead to the behavioral manifestations of ADHD, and to reveal the importance of the early experiences of a genetically vulnerable child for the behavioral occurrence of the disorder.
