ADHD: Need for a dimensional approach
There has been recent impetus on psychiatric classificatory and diagnostic systems to move gradually towards a more dimensional model as opposed to categorical models. This is true for ADHD (attention deficit hyperactivity disorder) as well. ADHD is among the most common of childhood onset disorders with approximate prevalence rates of 8% in school children. ADHD was earlier conceptualised as a neurodevelopmental disorder with executive dysfunction as the core deficit. This model proved to be over simplistic. Gradually, literature built up to include deficits in working memory, processing speed, delay aversion, inhibitory control, timing anticipation and decision making as the other core features of ADHD.