![]() ![]() Environmental Exposure to Toxins and ChemicalsĮxposure to substances, especially lead, may be a contributing factor. These genes may have to do with the processes of certain neurotransmitters, or chemical messengers in the brain, such as dopamine, which plays a role in the brain’s reward systems and in regulating impulsivity and movement. Scientists believe multiple genes may be involved because of the complexity of the condition, say experts at the National Human Genome Research Institute. The specific genes associated with ADHD have not yet been identified. GeneticsĬurrent evidence suggests ADHD has a genetic component - meaning it seems to run in some families, according to the aforementioned research published in the Lancet Psychiatry. Several factors may increase a child's likelihood of developing ADHD. Not all people with ADHD show the same circuits or changes in circuits, but certain brain differences are more common in people with ADHD than those without it. These circuits are related to sustained attention, control of inhibitions, motivation, and regulation of emotions, suggests research published in the Lancet Psychiatry. Neuroimaging studies using magnetic resonance imaging (MRI) scans to look at brain structure have found that certain neural circuits in the brain are associated with ADHD. As with most mental health conditions, it is thought to be an interplay of biological, social, and psychological factors, according to CHADD.
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