Adhd Info

The shift from a categorical to a more dimensional understanding has been driven by neuroimaging, genetics, and treatment response studies. This paper argues that ADHD is best understood as a disorder of functional connectivity in large-scale brain networks, particularly the default mode network (DMN) and the central executive network (CEN). The review proceeds as follows: Section 2 covers epidemiology and developmental trajectories; Section 3 details neurobiological mechanisms; Section 4 examines diagnostic criteria and pitfalls; Section 5 reviews evidence-based treatments; Section 6 explores adult outcomes; Section 7 discusses controversies and future directions. Prevalence: Meta-analyses (Polanczyk et al., 2014; 2023 update) estimate global prevalence at 5.9% in children/adolescents and 2.5% in adults. Rates vary by diagnostic method: teacher ratings yield higher estimates (~7-10%) than structured clinical interviews (~5%). Sex ratios are approximately 3:1 (male:female) in childhood, narrowing to 2:1 by adulthood as female-predominant inattentive presentations become more recognized.

ADHD, executive function, dopamine, methylphenidate, neurodevelopment, adult ADHD, comorbidity 1. Introduction Attention-Deficit/Hyperactivity Disorder (ADHD) has transitioned from a controversial diagnosis of disruptive boys to a well-validated neurobiological condition with persistent effects across the lifespan. First formally described by Sir George Still in 1902 as a "defect in moral control," the disorder was officially recognized in DSM-II (1968) as "Hyperkinetic Reaction of Childhood." The current DSM-5-TR (2022) defines ADHD by persistent patterns of inattention, hyperactivity, and impulsivity that are developmentally inappropriate, impair functioning, and present before age 12. The shift from a categorical to a more

DSM-5 requires onset before age 12, but longitudinal studies (e.g., the Dunedin cohort) identify a small group (~5-10% of adult ADHD cases) with first symptoms emerging in adulthood without childhood history. Whether this represents late-onset ADHD, a distinct disorder, or misattribution of symptoms to other conditions remains debated. Prevalence: Meta-analyses (Polanczyk et al

Up to 20% of college students without ADHD report nonmedical stimulant use (primarily for cognitive enhancement). Long-term effects of chronic misuse include cardiovascular risk and potential for psychosis at high doses. and Lifespan Management

This is a comprehensive academic-style paper on Attention-Deficit/Hyperactivity Disorder (ADHD), structured as a review article suitable for a psychology or neuroscience journal. It covers epidemiology, neurobiology, diagnosis, treatment, and adult outcomes. Attention-Deficit/Hyperactivity Disorder: A Multidimensional Review of Neurobiology, Diagnosis, and Lifespan Management