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Electroencephalography (EEG) beta frequency is associated with psychiatric symptoms, such as insomnia. The aim of this study was to investigate the relation between frontal beta power, psychological symptoms, and insomnia in the bereaved families.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Eighty\u2010four family members of the Sewol ferry victims (32 men and 52 women) were recruited and their EEG was compared with that of 25 (13 men and 12 women) healthy controls. A two\u2010channel EEG device was used to measure cortical activity in the frontal lobe. Symptom severity of insomnia, post\u2010traumatic stress disorder, complicated grief, and anxiety were evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The bereaved families showed a higher frontal beta power than healthy controls. Subgroup analysis showed that frontal beta power was lower in the individuals with severe insomnia than in those with normal sleep. There was a significant inverse correlation between frontal beta power and insomnia symptom in the bereaved families.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This study suggests that increased beta power, reflecting the psychopathology in the bereaved families of the Sewol ferry disaster, may be a compensatory mechanism that follows complex trauma. Frontal beta power could be a potential marker indicating the severity of sleep disturbances. Our results suggest that sleep disturbance is an important symptom in family members of the Sewol ferry disaster's victims, which may be screened by EEG beta power.<\/jats:p><\/jats:sec>","DOI":"10.1111\/pcn.12546","type":"journal-article","created":{"date-parts":[[2017,6,20]],"date-time":"2017-06-20T12:46:46Z","timestamp":1497962806000},"page":"759-768","source":"Crossref","is-referenced-by-count":18,"title":["Increased beta power in the bereaved families of the<scp>S<\/scp>ewol ferry disaster:<scp>A<\/scp>paradoxical compensatory phenomenon?<scp>A<\/scp>two\u2010channel electroencephalography study"],"prefix":"10.1111","volume":"71","author":[{"given":"Kuk\u2010In","family":"Jang","sequence":"first","affiliation":[{"name":"Department of Biomedicine and Health Sciences, College of Medicine The Catholic University of Korea Seoul South Korea"},{"name":"Institute of Biomedical Industry The Catholic University of Korea Seoul South Korea"},{"name":"Department of Psychiatry, Clinical Emotion and Cognitive Research Laboratory Ilsan Paik Hospital, Inje University Goyang South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miseon","family":"Shim","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Clinical Emotion and Cognitive Research Laboratory Ilsan Paik Hospital, Inje University Goyang South Korea"},{"name":"Department of Biomedical Engineering Hanyang University Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sang Min","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Biomedicine and Health Sciences, College of Medicine The Catholic University of Korea Seoul South Korea"},{"name":"Institute of Biomedical Industry The Catholic University of Korea Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyu Jung","family":"Huh","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, College of Medicine The Catholic University of Korea Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung","family":"Huh","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, College of Medicine The Catholic University of Korea Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ji\u2010Young","family":"Joo","sequence":"additional","affiliation":[{"name":"Institute of Biomedical Industry The Catholic University of Korea Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0305-3709","authenticated-orcid":false,"given":"Seung\u2010Hwan","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Clinical Emotion and Cognitive Research Laboratory Ilsan Paik Hospital, Inje University Goyang South Korea"},{"name":"Department of Psychiatry Ilsan Paik Hospital, Inje University Goyang South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeong\u2010Ho","family":"Chae","sequence":"additional","affiliation":[{"name":"Department of Biomedicine and Health Sciences, College of Medicine The Catholic University of Korea Seoul South Korea"},{"name":"Institute of Biomedical Industry The Catholic University of Korea Seoul South Korea"},{"name":"Department of Psychiatry, College of Medicine The Catholic University of Korea Seoul South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,7,31]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-319-26561-2_7"},{"key":"e_1_2_8_3_1","doi-asserted-by":"crossref","unstructured":"KimM\u2010K KimS\u2010P. 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