theory of cohen and kakan confirmed steele's hypothesis; these scientists considered the problem with dwgo be biological. the onset of the disorder is a consequence of disruption of the nervous system. in the forties of the last century, the term minimal brain dysfunction came into use. scientists then described a set of behavioral reactions of the child, restlessness, sleep disturbance inattention, and they said that they go a little beyond the established norms, this is due to the peculiarities of the development of the nervous system. further, the concept of minimal brain dysfunction was transformed into... hyperkenesis, a sudden involuntary movement of the muscles of children's attention, and only in the seventies of the 20th century, the term attention deficit disorder first appeared. according to various estimates, from 3 to 20% of children suffer from adhd. moreover, recent research from cambridge suggests that some symptoms. disorders persist into adulthood, although previously it was believed that this is a childhood story that grows over the years, and also making this diagnosis