Attention-deficit hyperactivity disorder: Classification
ADHD is a developmental disorder, in that, in the diagnosed population, certain traits such as impulse control significantly lag in development when compared to the general population[8]. Using magnetic resonance imaging, this developmental lag has been estimated to range between 3 years, to 5 years in the prefrontal cortex of those with ADHD patients in comparison to their peers[9]; consequently these delayed attributes are considered an impairment. ADHD has also been classified as a behavior disorder and a neurological disorder [10] or combinations of these classifications such as neurobehavioral or neurodevelopmental disorders.
Three forms of ADHD are thought to exist, ADHD-PI or ADHD Primarily Inattentive (previously known as ADD or Attention Deficit Disorder), ADHD-PH/I or ADHD Primarily Hyperactive/Impulsive, and ADHD-C or combined type. The majority of studies have looked at ADHD-C, with much less work done on ADHD-PI
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