Attention Deficit Hyperactivity Disorder (cont.)
IN THIS ARTICLE
What Causes Childhood ADHD?
The pathogenesis (cause) of ADHD has not been totally defined. One theory springs from observations regarding variations in functional brain-imaging studies between those with and without symptoms. Similar variations have been shown in studies of the structure of the brain of affected and unaffected individuals. Animal studies have demonstrated differences in the chemistry of brain transmitters involved with judgment, impulse control, alertness, planning, and mental flexibility. A genetic predisposition has been demonstrated in (identical) twin and sibling studies. If one identical twin is diagnosed with ADHD, there is a 92% probability of the same diagnosis in the twin sibling. When comparing nonidentical twin sibling subjects, the probability falls to 33%. Overall population incidence is felt to be 8%-10%.
Genes that control the relative levels of chemicals in the brain called neurotransmitters seem to be different in ADHD, and levels of these neurotransmitters are out of normal balance.
The six major tasks of executive function that are most commonly distorted with ADHD are the following:
Medically Reviewed by a Doctor on 7/14/2016
YOU MAY ALSO LIKE
Must Read Articles Related to Attention Deficit Hyperactivity Disorder
Patient Comments & Reviews
The eMedicineHealth doctors ask about ADHD (Attention Deficit Hyperactivity Disorder in Children):
Childhood ADHD - Tests
What tests were used to diagnose your child's ADHD?
ADHD - Experience
Please describe your experience with ADHD.
Attention Deficit Hyperactivity Disorder - Symptoms
Please describe the severity of your child's ADHD symptoms.
Attention Deficit Hyperactivity Disorder - Treatment
What treatment has been effective for your child's ADHD?