Abstract

Part I: Conceptual Context. ADHD's Controversies. Defining Disorder. Part II: How Does ADHD Work? Neural Systems. Attention and Arousal. Executive Functioning or Cognitive Control. Motivation. Motor Control and Timing. Part III: Where Does ADHD Come From? Multiple Pathways. Genetic Effects. Uncommon Experiential Risk Factors. Common Experiential Risk Factors. Part IV: Integration. Multiple Pathways Reconsidered. Conclusion.