Mechior Adam Weikard wrote a textbook about lack of attention in 1775
Sir Alexander Crichton noted that a person could be born with an attention disorder about 20 years later.
Heinrich Hoffmann was the first to consider what is ADHD today in 1865.
Kurt Goldstein reported psychological effects of brain injury in soldiers who suffered head wounds in WWI.
Dr. George F. Still with "Defective Moral Control" in 1902 1. Still speculated that many of these children had mild brain pathology. 2. Many of these children had normal intelligence 3. The condition was more prevalent in males than females. 4. There was evidence that the condition had a hereditary basis. 5. Many of the children and their relatives also had other physical or psychological problems, such as depression and tics.
Heinz Werner and Alfred Strauss in 1930s and 40s noted the same behaviors of distractibilitity and hyperactivity in some children with intellectual disabilities.