In the 1970s, the number of ADHD diagnoses rose when doctors recognized that hyperactive children also had significant problems paying attention to tasks or listening to their teachers. Not much more was known about ADHD or how it affected the brain.
For decades, the syndrome now known as attention deficit hyperactivity disorder (ADHD or ADD) was seen simply as a childhood behavior characterized by chronic restlessness, impulsivity, and an inability to sit still.
