.1. Internet addiction in children with ADHD
Attention-deficit/hyperactivity disorder (ADHD), one of the most common childhood and adolescent psychiatric disorders, has been associated with abuse of stimulants [1], alcohol [2], and nicotine [3]. Interestingly, recent studies and demographic reports have noted a high comorbidity of ADHD and Internet addiction [4]. A significant relationship between Internet use and ADHD has been shown in elementary school children [5]. In a survey of 2114 Taiwanese high school students, Yen et al (2007) [6] reported that 17.9% of students were classified as Internet addicts and that Internet addiction was strongly associated with ADHD symptoms. Moreover, in a cohort study of Internet video game playing, Chan and Rabinowitz [7] found that continuous video game play was associated with ADHD behaviors, such as oppositional behavior and hyperactivity, in healthy adolescents.