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[7] [13] The exact causes of ADHD are still not fully understood, but non-genetic biological risk factors (e.g., low birth weight, events during pregnancy) and environmental factors are also thought to play a role in the development of ADHD. [12] [13] [15]
A genetic variant associated with ADHD has been found at higher frequency in more nomadic populations and those with more of a history of migration. [10] Consistent with this, the health status of nomadic Ariaal men was higher if they had the ADHD associated genetic variant (7R alleles), whereas in recently sedentary (non-nomadic) Ariaal ...
However, in rare cases, ADHD can be caused by a single event including traumatic brain injury, [45] [50] [51] [52] exposure to biohazards during pregnancy, [8] or a major genetic mutation. [53] There is no biologically distinct adult-onset ADHD except for when ADHD occurs after traumatic brain injury. [54] [8]
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Learning disorders can affect a person more than you might imagine. Someone struggling with attention deficit hyperactivity disorder (ADHD), for instance, may struggle with impulsive behaviors ...
Large, high quality research has found small differences in the brain between ADHD and non-ADHD patients. [1] [15] Jonathan Leo and David Cohen, critics who reject the characterization of ADHD as a disorder, contended in 2003 and 2004 that the controls for stimulant medication usage were inadequate in some lobar volumetric studies, which makes it impossible to determine whether ADHD itself or ...
New research affirms what we've known for more than 20 years now: Attention deficit hyperactivity disorder doesn't just affect boys—it's increasingly diagnosed across all age groups, especially ...
Distinguishing between ASD and other diagnoses can be challenging because the traits of ASD often overlap with symptoms of other disorders, and the characteristics of ASD make traditional diagnostic procedures difficult. [2] [3] Autism is associated with several genetic disorders, [4] perhaps due to an overlap in genetic causes. [5]
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