ADHD

**Attention-Deficit/Hyperactivity Disorder (ADHD) **
ADHD is a heterogeneous, developmental, neurobiological disorder that is characterized by chronic inattention and/or hyperactivity causing cognitive processing deficits, and impaired executive regulation and inhibition. (Schazt & Rostain, 2006; Smith & Adams, 2006; Kellner, Houghton, & Douglas, 2003).

The American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders, 4th Edition (DSM-IV) outlines three subtypes of ADHD as follows: 1. Predominantly inattentive type (ADHD-I) 2. ADHD combined type (ADHD-C) 3. ADHD predominantly hyperactive/impulsive type (ADHD-H/I) (Ollendick et al., 2008)

Predominantly inattentive type (ADHD-I) is reported to be the most common form of ADHD, followed by combined (ADHD-C), and hyperactive-impulsive type (ADHD- HI) (Döpfner et al., 2008).