Causes of ADHD
Perhaps as you know, genetics play an important role in the transmission of this disorder which affects between 4 and 5% of the population. The symptoms of ADHD are present as of childhood and we know now that they persist through adulthood in the majority of cases. We, as physicians, thus treat children but also parents and adults who struggle to reduce the impact that the symptoms of ADHD entail in their daily lives.
ADHD has a genetic component in most cases and can, more rarely, also be tied to the consequences of a neurological condition at an early age (e.g., premature birth, neonatal problem, early neurological disease of an infectious nature, such as meningitis).
ADHD is a neurological condition; it is not caused by a poor upbringing or by psychological stressors. However, one's environment can modulate its expression and course. For example, the presence or absence of help and support to remedy this disorder can generate anxiety, undermine self-esteem, and give rise to behaviour problems (e.g., opposition and delinquency).
To explain ADHD, scientists have advanced the hypothesis of a dysfunction at the level of certain information-transmission mechanisms involving neurotransmitters such as dopamine and noradrenaline. To gain a better understanding of the effects of ADHD, we might compare how information circulates in the brain to a road network. Studies of brain function in persons with ADHD have revealed an impairment of the region responsible for controlling or inhibiting certain behaviours (in medical jargon, these are referred to as "executive functions"), they are what allow, among other things, turning on the engine, breaking, changing directions and prioritizing on the road. In ADHD, the information-transmission network appears to be defective, as though it was lacking traffic lights and road signs and as though the automobiles were equipped with a faulty ignition or brake system.
Latest
Québec Symposium
Québec, May 15-16, 2008
New program!
ADDA's 2008 National Meeting
July 10-13, 2008
The 2nd biennial, international conference: BRAIN DEVELOPMENT & LEARNING: MAKING SENSE OF THE SCIENCE July 12-15, 2008
20th Annual CHADD International Conference
November 13-15, 2008
2nd International Congress on ADHD
May 21 - 24, 2009
Cognitive-Behavioral Therapy for Adult ADHD:
An Integrative Psychosocial and Medical Approach
ADHD in Adults:
What the Science Says
