turned their focus of research to attention problems. The theory arose that children's behavioral problems were due to deficits in attention and not hyperactivity. According to Armstrong, there were over two thousand published studies on attention deficits by the end of the 1970s. In 1980, the APA listed this new disease as "attention deficit disorder" in the third edition of its influential Diagnostic and Statistical Manual. In this same decade, there was a boom in ADD research. By the 1990s ADD caught the attention of the media and soon, millions were talking about this new disorder (Cherkes-Julkowski, Sharp, & Stolzenberg, 1997).
             It is not currently known what causes ADD. There has been much controversy over what actually causes it. Most researchers would agree that there is more than just one cause. Of all of the factors discussed among experts, the most popular are genetics, brain lesions, and allergic reactions
             ...