There is a fair amount of debate as to whether ADHD is a
developmental delay type of disorder. We are seeing a growing
body of research which supports this assertion. One of these
supporting pieces of evidence is a recent study done by McAlonan
and coworkers on the topic of how relative volumes of specific
brain regions correlates to ADHD behaviors such as inhibiting
certain responses (a deficiency marked by impulsivity, a key
attribute of ADHD), as well as the ability to shift attention to
another area and refocus (a deficiency which is especially
pronounced in ADHD individuals who exhibit symptoms or diagnoses
of comorbid Obsessive Compulsive Disorders or OCD ).
Additionally, a relatively mild (but still notable) association
was seen between age and improvement in reaction times for
inhibiting responses and shifting focus, which suggests that the
increasing of brain volumes (for specific brain regions) during
the childhood developmental process can result insubsequent
improvements with regards to efficiency