A historical term applied to individuals with intellectual disabilities who exhibit high levels of distractibility and hyperactivity.

ADHD

Explanation:

Attention Deficit Hyperactivity Disorder is a medical term used for individuals who suffer through high levels of distraction and inability to focus in one place for a long period of time. these individuals are said to be hyperactive as well.

Their brain continuously runs in different directions which makes it harder to focus on one line of thoughts. This is also known as minimal brain injury in historic terms which is now evolved to ADHD.