Led to definition of hyperactive child syndrome in. Children who lacked self control and showed symptoms of overactivity/inattention in school were said to have poor inhibitory volition and. Following the worldwide influenza epidemic from 1917-1926. 1940s-1950s minimal brain damage and minimal brain dysfunction . Deficits in attention and impulse control, in addition to hyperactivity, were seen as the primary symptoms. Key symptoms fall under two well documented categories. Using these dimensions to define adhd oversimplifies the disorder. Inability to sustain attention, particularly for repetitive, structured and less enjoyable tasks. Deficits may be seen in one or more types of attention. = inability to voluntarily inhibit dominant or on going behavior. Moving, running, touching everything in sight excessive talking, and pencil tapping. Excessively energetic intense, inappropriate, and not goal directed. Inability to control immediate reactions or to think before acting. Cognitive impulsivity includes disorganization hurried thinking, and need for supervision. Behavioral impulsivity includes difficulty inhibiting responses when situations require it.