• 대한건축학회논문집:계획계
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• 제34권9호
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• pp.55-66
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• 2018

This study aims to propose color affective model of indoor space by evaluating subjects' physiological responses according to the types of behavioral and affective system. 99 subjects(44 females, 55 males) in their 20s, who had no disorders in visual perception, participated in the experiment. To categorize the subjects based on behavioral and affective system, BAS/BIS scale and Affective scale were used. Color stimuli were composed of five basic colors and three tones: vivid, pale and dull tone of R, Y, G, B, P. For physiological experiment, right and left prefrontal alpha activity was measured to analyze prefrontal EEG asymmetry. Participants were exposed to fifteen color stimuli for 20 seconds each other under the positive and negative emotional condition in a research room with the natural light blocked. The results and conclusion of this study are as follows. Along with factors of behavioral and affective system, cluster analysis was carried out and four types were classified. Type A had high BAS sensitivity, especially high 'drive' trait, and showed high levels of 'anxiety' and 'anger'. Type B had low BAS sensitivity, especially low 'fun seeking' and low 'drive' trait, and showed low levels of 'anxiety' as well as low levels of 'happiness'. Type C had low BIS sensitivity and showed high levels of 'happiness' and low levels of 'sadness'. Type D had high BIS sensitivity and showed high levels of 'lethargy' and 'sadness'. As a result of EEG signal analysis of color stimuli, Type B, Type C, and Type D showed significant differences in prefrontal alpha asymmetry under the negative emotional stimuli. Type B showed more left prefrontal activation in the spaces with pale R and dull G. Type C showed more left prefrontal activation in the spaces with vivid Y and B, pale R, and dull R, G, P. Type D showed more left prefrontal activation in the spaces with vivid Y and P, pale R, Y, P, and dull R, Y, G, B, P. The group of high BAS sensitivity was not influenced by color stimuli under the emotional conditions, whereas the group of high BIS sensitivity was affected by color stimuli under the negative emotional conditions. They showed left prefrontal activation when they were exposed the spaces with vivid, pale, dull tones of Y and P wall.

• 디지털융복합연구
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• 제15권8호
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• pp.501-509
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• 2017

본 연구는 과훈련에 따른 선수의 인지정보처리와 정서변화에 관련된 국내 외 문헌들을 고찰하여 과훈련 시 유발되는 신체적 피로감이 어떻게 선수들의 인지정보처리와 정서변화에 미치는 영향을 신경생리학적으로 연구할 필요성을 제시하고, 스포츠 현장에서 활동하고 있는 선수와 코치들에게 뇌 생리적 관점에서 과훈련 증상에 대한 이해를 높일 수 있는 기초자료를 제공하는데 있다. 전자데이터베이스를 이용하여 최근 20년간 발행된 국내외 학술자료 및 연구보고서 등을 검토하였으며, 검색된 학술 문헌 중 본 연구의 목적에 부합되는 문헌들을 중심으로 검토하였다. 검토한 문헌을 바탕으로 과훈련에 따른 선수의 인지정보처리와 정서변화에 대하여 검토한 결과, 신체의 피로감이 과훈련을 통해 누적되어 운동수행 저하뿐만 아니라 선수들의 인지 및 정서적 능력 측면에서도 문제가 발생될 수 있다는 것을 알 수 있었다. 그리고 ERP를 이용한 P300의 진폭과 잠재기 및 EEG를 이용한 대뇌반구비대칭 차이지표를 이용한 접근은 과훈련이 인지정보처리과정과 정서적 변화에 미치는 효과를 뇌생리심리적으로 이해시킬 수 있는 새로운 연구방법의 가능성도 확인하였다.

• Clinical and Experimental Pediatrics
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• 제54권1호
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• pp.22-28
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• 2011

Purpose: To investigate the clinical characteristics of late-onset epilepsy combined with autism spectrum disorder (ASD), and the relationship between certain types of electroencephalography (EEG) abnormalities in ASD and associated neuropsychological problems. Methods: Thirty patients diagnosed with ASD in early childhood and later developed clinical seizures were reviewed retrospectively. First, the clinical characteristics, language and behavioral regression, and EEG findings of these late-onset epilepsy patients with ASD were investigated. The patients were then classified into 2 groups according to the severity of the EEG abnormalities in the background rhythm and paroxysmal discharges. In the severe group, EEG showed persistent asymmetry, slow and disorganized background rhythms, and continuous sharp and slow waves during slow sleep (CSWS). Results: Between the two groups, there was no statistically significant difference in mean age (P=0.259), age of epilepsy diagnosis (P=0.237), associated family history (P=0.074), and positive abnormal magnetic resonance image (MRI) findings (P=0.084). The severe EEG group tended to have more neuropsychological problems (P=0.074). The severe group statistically showed more electrographic seizures in EEG (P=0.000). Rett syndrome was correlated with more severe EEG abnormalities (P=0.002). Although formal cognitive function tests were not performed, the parents reported an improvement in neuropsychological function on the follow up checkup according to a parent's questionnaire. Conclusion: Although some ASD patients with late-onset epilepsy showed severe EEG abnormalities, including CSWS, they generally showed an improvement in EEG and clinical symptoms in the longterm follow up. In addition, severe EEG abnormalities tended to be related to the neuropsychological function.

• 대한약침학회지
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• 제22권3호
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• pp.166-170
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• 2019

Objectives: Attentional and memory functions are important aspects of neural plasticity that, theoretically, should be amenable to pharmacopuncture treatments. A previous study from our laboratory suggested that quantitative electroencephalographic (qEEG) measurements of theta/beta ratio (TBR), an index of attentional control, may be indicative of academic performance in a first-semester medical school course. The present study expands our prior report by extracting and analyzing data on frontal theta and beta asymmetries. We test the hypothesis that the amount of frontal theta and beta asymmetries (fTA, fBA), are correlated with TBR and academic performance, thereby providing novel targets for pharmacopuncture treatments to improve cognitive performance. Methods: Ten healthy male volunteers were subjected to 5-10 min of qEEG measurements under eyes-closed conditions. The qEEG measurements were performed 3 days before each of first two block examinations in anatomy-physiology, separated by five weeks. Amplitudes of the theta and beta waveforms, expressed in ${\mu}V$, were used to compute TBR, fTA and fBA. Significance of changes in theta and beta EEG wave amplitude was assessed by ANOVA with post-hoc t-testing. Correlations between TBR, fTA, fBA and the raw examination scores were evaluated by Pearson's product-moment coefficients and linear regression analysis. Results: fTA and fBA were found to be negatively correlated with TBR (P<0.03, P<0.05, respectively) and were positively correlated with the second examination score (P<0.03, P=0.1, respectively). Conclusion: Smaller fTA and fBA were associated with lower academic performance in the second of two first-semester medical school anatomy-physiology block examination. Future studies should determine whether these qEEG metrics are useful for monitoring changes associated with the brain's cognitive adaptations to academic challenges, for predicting academic performance and for targeting phamacopuncture treatments to improve cognitive performance.

• 전기학회논문지P
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• 제61권1호
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• pp.55-58
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• 2012

By using EEG and HRV, subjects were estimated on their psychological and physiological reaction when reading psychrometric chart in 7 point century font, in an environmental test room in the condition of temperature 25[$^{\circ}C$], relative humidity 50[RH%], air current speed 0.02[m/sec], giving variation in illuminance to 0.1, 300, 600, 1000, 1300 and 1600[lux]. As a result, it was at 1300[lux] that absolute ${\alpha}$ wave, SMR, SDNN were most vitalized, and also both sides ${\alpha}$ wave asymmetry index, SEF50, HRT, stress and fatigue degree were at the lowest. It was found that a certain illuminance which minimizes psychological stress and fatigue degree while enhancing concentration and task achievement stably does exist.

• 대한불안의학회지
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• 제4권2호
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• pp.127-134
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• 2008

Objective : This study examined whether major depressive disorder patients with anxiety traits displayed abnormal electroencephalographic (EEG) alpha asymmetries. Methods : Resting EEG was recorded in 11 outpatients with major depressive disorder (6 of whom had a high anxiety trait while 5 exhibited a low anxiety trait) and 6 controls. Results : In contrast to the controls, within the major depressive disorder patient group, comorbid anxiety disorder showed alpha asymmetry indicative of less activation over right than over left temporal sites. Patients diagnosed with major depressive disorder but no anxiety disorder showed a reduced temporal alpha asymmetry, supporting the potential importance of evaluating anxiety in studies of regional brain activation, in depressed patients. Conclusion : These findings suggest that anxiety is associated with brain hypoactivation, especially with right temporal hypoactivation.

• 한국산학기술학회논문지
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• 제18권11호
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• pp.166-175
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• 2017

이 연구는 범죄피해자 지원기관인 (사)한국피해자지원협회(KOVA; Korea Organization Victicm Assistance)에서 2017년 7월 피해상담 전문가의 심리상담을 진행한 두 폭력 가정의 피해자녀들을 대상으로 이루어졌다. 연구참여자는 가정폭력에 대한 피해 호소가 10년이 넘은 가정으로서 폭력피해사실에 대해 경찰서에 직접 신고되어 접수된 이력이 있고 또 피해자녀와 피해자인 어머니가 단기쉼터에 입소하여 함께 거주한 경험이 있는 가정이었다. 가정폭력의 경우 자녀들은 특히, 미성년자인 경우 부모가 제공하는 생활공간에서 폭력피해를 입더라도 자발적으로 벗어나기 어려운 상태에 있으며, 폭력경험을 지속적이고 반복적으로 당하게 된다. 이에 가정폭력 피해자녀들이 현재 가해자-피해자 관계의 부모와 함께 거주하면서 어떤 감정 양상을 나타내고 있는지 그 특성을 정량화된 뇌파 데이터를 수집하고 분석하여 확인하고자 하였다. 뇌파측정은 서울불교대학원 부설 뇌과학연구소에서 진행하였으며, 뇌파측정 데이터 수집은 국제적으로 표준화된 19채널 뇌파측정도구인 브레인마스터를 사용하였고, 데이터 처리는 뉴로가이드를 사용하였다. 가정폭력을 경험한 피해자녀의 감정양상을 정량적 수치 및 뇌지형도를 통하여 분석한 결과 전두엽에 있어서 과잉서파의 문제, 알파파 좌우비대칭, 고베타파 좌우비대칭의 문제를 발견하였다.

• ETRI Journal
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• 제35권6호
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• pp.1105-1114
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• 2013

Owing to the large number of video programs available, a method for accessing preferred videos efficiently through personalized video summaries and clips is needed. The automatic recognition of user states when viewing a video is essential for extracting meaningful video segments. Although there have been many studies on emotion recognition using various user responses, electroencephalogram (EEG)-based research on preference recognition of videos is at its very early stages. This paper proposes classification models based on linear and nonlinear classifiers using EEG features of band power (BP) values and asymmetry scores for four preference classes. As a result, the quadratic-discriminant-analysis-based model using BP features achieves a classification accuracy of 97.39% (${\pm}0.73%$), and the models based on the other nonlinear classifiers using the BP features achieve an accuracy of over 96%, which is superior to that of previous work only for binary preference classification. The result proves that the proposed approach is sufficient for employment in personalized video segmentation with high accuracy and classification power.

• 한국산학기술학회논문지
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• 제18권12호
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• pp.452-458
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• 2017

본 연구에서는 2016년 7월부터 2017년 6월까지 1년 동안 뇌파 측정 신호를 이용한 우울증 진단장치를 개발하였다. 정상인의 경우 좌측 알파파가 우측 알파파에 비해 활성화되는 양상을 보이고, 우울증 환자의 경우 반대로 우측 알파파가 더 활성화된다. 뇌파의 잡음제거와 증폭을 위해 아날로그 회로와 디지털 저역통과필터를 사용하였고, 고속 푸리에 변환을 실시할 때 발생하는 신호의 누수를 제거하기 위해 해밍 창 함수를 적용하였다. 개발한 진단장치의 유효성능을 확인하기 위해 평균연령 24세의 대학교 3, 4학년 학생 20명을 대상으로 뇌파 측정을 실시하였다. 우울증 판독을 하기 위해 좌, 우 알파파의 상대 값을 계산한 결과 최솟값은 66.7, 최댓값은 113.3의 값을 가졌으며, 평균값은 92.2이었다. 또한 20명 중 7명이 90~95 사이에 해당되었고, 우울 점수의 평균 편차가 20가량 높은 사람의 경우 경미한 우울증세의 경향을 보였다. 본 연구 결론을 향후 좌, 우 뇌 비대칭 해소를 통한 우울증 치료기 제작 시 유의미한 자료로 사용할 수 있으며 다수의 우울증 환자에 대한 임상실험이 이루어질 경우 실제적 우울증 진단에 유용하게 적용할 수 있다.

• Child Studies in Asia-Pacific Contexts
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• 제5권2호
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• pp.63-81
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• 2015

The present study examined electrical brain activations in participants playing three different video games. Forty-five adolescents between the ages of 13-17 (M=14.3 years, SD=1.5) were randomly assigned to play either a violent game, non-violent game, or brain training game. Electroencephalography (EEG) was recorded during video game play. Following game play, participants completed a questionnaire measuring prosocial personality. Results show an association between prosocial personality factors and differential patterns of brain activation in game groups. Adolescents with higher empathy playing the brain training game were positively correlated with frontal asymmetry scores, while empathy scores for those in non-violent and violent game groups were negatively linked to frontal asymmetric activation scores. Those with higher scores in helpfulness in the non-violent game group showed a positive association to left hemisphere activation. Implications behind these findings are discussed in the manuscript.