It is not uncommon for these children to have learning disorders and/or depression, ADHD (Attention Deficit Hyperactivity Disorder
), and maybe even Oppositional Defiance Disorder
(another less serious - but annoying - behavioral disorder).
These children usually do not handle direct orders very well, and they challenge rules.
Often times, these children, upon brain scanning, show something wrong in their frontal lobe, which helps them in impulse control, avoiding danger, planning, etc.