For over 100 years, the symptoms that constitute ADHD have been continuously refined by the scientific community. Many researchers note that one of the earliest scholarly papers on symptoms consistent with ADHD was written in 1902 by George Still, in which he described a series of children who exhibited impulsivity, inattentiveness and restlessness, and showed intense emotional and behavioral problems. At the time it was commonly thought that lack of inattention and inhibitory control was the...