title: Differential resting-state EEG patterns associated with comorbid depression in Internet addiction.
abstract: OBJECTIVE
  Many researchers have reported a relationship between Internet addiction and depression. In the present study, we compared the resting-state quantitative electroencephalography (QEEG) activity of treatment-seeking patients with comorbid Internet addiction and depression with those of treatment-seeking patients with Internet addiction without depression, and healthy controls to investigate the neurobiological markers that differentiate pure Internet addiction from Internet addiction with comorbid depression.
  
  
  METHODS
  Thirty-five patients diagnosed with Internet addiction and 34 age-, sex-, and IQ-matched healthy controls were enrolled in this study. Patients with Internet addiction were divided into two groups according to the presence (N=18) or absence (N=17) of depression. Resting-state, eye-closed QEEG was recorded, and the absolute and relative power of the brain were analyzed.
  
  
  RESULTS
  The Internet addiction group without depression had decreased absolute delta and beta powers in all brain regions, whereas the Internet addiction group with depression had increased relative theta and decreased relative alpha power in all regions. These neurophysiological changes were not related to clinical variables.
  
  
  CONCLUSIONS
  The current findings reflect differential resting-state QEEG patterns between both groups of participants with Internet addiction and healthy controls and also suggest that decreased absolute delta and beta powers are neurobiological markers of Internet addiction.
authors: Department of Psychiatry, Gangnam Eulji Hospital, Eulji University, Seoul, Republic of Korea.
authors: Jaewon
authors: J
authors: Lee
authors: Department of Psychiatry, Kangdong Sacred Heart Hospital, Seoul, Republic of Korea.
authors: Jae Yeon
authors: JY
authors: Hwang
authors: Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea.
authors: Su Mi
authors: SM
authors: Park
authors: Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
authors: Hee Yeon
authors: HY
authors: Jung
authors: Department of Psychiatry, Gangnam Eulji Hospital, Eulji University, Seoul, Republic of Korea.
authors: Sam-Wook
authors: SW
authors: Choi
authors: Department of Psychiatry, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Republic of Korea.
authors: Dai Jin
authors: DJ
authors: Kim
authors: Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
authors: Jun-Young
authors: JY
authors: Lee
authors: Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea. Electronic address: choijs73@gmail.com.
authors: Jung-Seok
authors: JS
authors: Choi
mesh_terms: D016739:Behavior, Addictive / Q000150:complications* / Q000503:physiopathology*; D001921:Brain / Q000503:physiopathology*; D058256:Brain Waves / Q000502:physiology; D016022:Case-Control Studies; D003863:Depression / Q000150:complications* / Q000503:physiopathology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D012146:Rest / Q000502:physiology; D055815:Young Adult
keywords: Depression; Internet addiction; QEEG; Resting-state