• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2011년도 추계학술대회
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• pp.11-12
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• 2011

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제32권3호
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• pp.93-98
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• 2021

Electroencephalography (EEG) measures neural activation due to various cognitive processes. EEG and event-related potentials (ERPs) are widely used in studies investigating psychopathology and neural substrates of psychiatric diseases in children and adolescents. The present study aimed to review recent ERP studies in child and adolescent psychiatry. ERPs are non-invasive methods for studying synaptic functions in the brain. ERP might be a candidate biomarker in child-adolescent psychiatry, considering its ability to reflect cognitive and behavioral functions in humans. For the EEG study of psychiatric diseases in children and adolescents, several ERP components have been used, such as mismatch negativity, P300, error-related negativity (ERN), and reward positivity (RewP). Regarding executive functions and inhibition in patients with attention-deficit/hyperactivity disorder (ADHD), P300 latency, and ERN were significantly different in patients with ADHD compared to those in the healthy population. ERN showed meaningful changes in patients with anxiety disorders, such as generalized anxiety disorder, separation anxiety disorder, and obsessive-compulsive disorder. Patients with depression showed significantly attenuated RewP compared to the healthy population, which was related to the symptoms of anhedonia.

• 전자공학회논문지S
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• 제34S권12호
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• pp.60-69
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• 1997

We present an average method based on the multirate signal processing and dynamic allocation average for the purpose of monitoring event-related potentials(ERP) and continuously and dynamically. In the proposed method, first, latency shifts are detected through the cross correlation between a current response and the reference response. Then, the multirate signal processing which is composed of up-sampler, lowpass filter, and down sampler is performed to compensate the latency shifts of the reference response, therefore we obtain the reference response with a peak latencies compenated by those of a current response. Finally, the single response is obtained by averaging the compensated reference response and a current response. In the simulation, the results of quantitative evaluation by simulation and the results using linical data are presented. From the result, the proposed method reflects dynamic time-varying ERP more exactly than previous methods and is also effective in consecutive monitoring of ERP.

• 한국인지과학회:학술대회논문집
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• 한국인지과학회 2010년도 춘계학술대회
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• pp.48-54
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• 2010

INTRODUCTION Interaction between temporal events at the millisecond level is important for visual and tactile interaction. OBJECT The aim of the present study is to identify any neural signature, as reflected in event-related potentials (ERP), for the integrative processes when the two sensory modalities are stimulated in synchrony as opposed to when they are stimulated separately. METHOD The basic strategy was to compare ERP signals obtained with simultaneous visual and tactile stimulation with a linear summation of ERP patterns obtained with each modality stimulated separately. Condition were presented, paired with various stimulus-onset-asynchronies (SOA) ranging from - 300 ms (tactile-first) to 300 ms (visual-first), and in trials where only one modality was stimulated alone. RESULT A positive deviation was located in observed ERP at C4 electrode (contralateral to the stimulated hand) at 200-400 ms, in comparison to the predicted ERP. The deviation was present at all SOAs other than -300ms (tactile-first) and 300 ms (visual-first). There was also a positive deviation at occipital leads at the 50-ms SOA (visual-first) trials. DISCUSSION It suggested that neural signatures of cross-modal integration occur within a limited time-window. The deviations were specifically localized at the contralateral somatosensory and visual cortices, indicating that the integration happens at or before the level of the primary cortices.

• 한국문헌정보학회지
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• 제52권4호
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• pp.91-110
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• 2018

본 연구는 비디오 스킴의 자동 생성을 위한 비디오 요약 알고리즘을 제안하고 이를 평가하였다. 제안된 알고리즘은 ERP(Event Related Potentials) 기반의 주제 적합성 모형, MMR(Maximal Marginal Relevance) 기법 및 판별분석기법을 사용하여 구현하였다. 제안한 ERP/MMR 기반 알고리즘을 이용하여 구성한 비디오 스킴의 품질과 유용성을 내재적 및 외재적 평가를 통해서 검증하였다. 내재적 및 외재적 평가에서 ERP/MMR 방법들의 평가 점수들은 각각 경쟁 기준으로 사용한 SBD(Shot Boundary Detection) 방법의 평가 점수 보다 유의미한 차이를 보이며 높게 나왔다. 그러나 이 두 평가에서 ERP/MMR(${\lambda}=0.6$) 방법의 평가 점수와 ERP/MMR(${\lambda}=1.0$) 방법의 평가 점수 간에 통계적으로 유의미한 차이는 없는 것으로 나타났다.

• The Korean Journal of Legal Medicine
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• 제39권4호
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• pp.115-119
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• 2015

We investigated event-related potentials (ERPs) to estimate the accuracy of eyewitness memories. Participants watched videos of vehicles being driven dangerously, from an anti-impaired driving initiative. The four-letter license plates of the vehicles were the target stimuli. Random numbers were presented while participants attempted to identify the license plate letters, and electroencephalograms were recorded. There was a significant difference in activity 300-500 milliseconds after stimulus onset, between target stimuli and random numbers. This finding contributes to establishing an eyewitness recognition model where different ERP components may reflect more explicit memory that is dissociable from recollection.

• 인지과학
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• 제27권3호
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• pp.421-439
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• 2016

새로운 한자합성어의 학습에서 의미 투명성의 효과를 행동 실험과 ERP 실험을 통해 조사하였다. 참가자들은 구성형태소와 단어 의미의 관계가 투명한 조건(=투명 신단어)과 불투명한 조건(=불투명 신단어)에서 3회기에 걸쳐 새로운 단어-의미쌍을 학습하였다. 학습 단계에서는 자기 조절 의미 학습 시간과 ERP를 측정하고, 검사 단계에서는 학습한 단어에 대한 어휘판단시간과 의미 회상 점수를 측정하였다. 의미 학습 시간, 어휘판단, 의미 회상 검사 모두에서 의미 투명성의 효과가 유의하게 나타났다. 투명 신단어의 경우, 불투명 신단어에 비해 의미 학습 시간이 더 짧았음에도 불구하고, 어휘판단이 더 정확하고 빨랐으며, 의미 회상 검사 수행이 더 좋았다. 의미 투명성 효과는 ERP의 N400 성분의 진폭에서도 나타났다. 단어 의미가 투명한 조건에 비해 불투명한 조건에서의 N400 진폭이 더 컸다. 본 연구의 결과는 단어 재인 연구에서 발견된 의미 투명성 효과가 단어 학습에서도 나타남을 보여주며, 이는 단어 학습에서 형태소 정보가 중요한 역할을 한다는 것을 시사한다.

• 한국산학기술학회논문지
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• 제14권10호
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• pp.5003-5011
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• 2013

본 논문은 정서-주의 태스크를 수행할 때의 신경학적, 행동학적 반응이 정서조절 능력을 반영할 수 있는지를 측정하였다. 이를 위해, 건강한 성인 남녀 19명을 대상으로 3일에 걸쳐 1일 1회씩 동일 시간대에 정서-주의 상호작용이 요구되는 실험을 수행하였다. 이 실험을 통해 정서를 유발하는 비디오를 보여주기 전과 후, 정서-주의 태스크를 수행할 때의 EEG와 반응시간이 측정되었다. ERP P100과 P300 성분 간의 밀접한 상관관계가 나타났으며, P100 진폭이 높을수록 P300 잠재기가 길게 나타났다. 또한 P300 잠재기가 길수록 반응시간이 길게 나타났다. 또한, 정서-주의 태스크를 수행할 때 ERP 성분과 반응시간에 개인별 차이가 존재하였다. 정서유발을 위해 사용된 비디오 자극의 유형에 관계없이 ERP 성분의 낮은 진폭과 빠른 잠재기를 나타낸 집단이 더 빠른 반응시간을 나타내었다. 이러한 반응특성은 목표인식에 대한 성급한 반응으로 해석될 수 있으며, 낮은 정서 조절력과 관련이 있다고 할 수 있다.

• 수면정신생리
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• 제1권1호
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• pp.36-46
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• 1994

The event-related potentials are difined as the changes in voltage that occur at paticular time before, during and after something that happens in the physical world or some psychological processes. The possibilities of clinical applications of ERP are considered because the endogenous potentials such as P3 and contingent negative variation(CNV) are determined by the psychological significance of the stimulus. The P3 is a positive wave that occurs when a subject detects an informative task-relevant stimulus. The P3 amplitude and latency are affected by the various factors as subjective probabilites, stimulus meaning and information transmission. It is suggested that P3 wave is associated with the decision making, cognitive or perceptual closure, memory updating and transfer of information to consciousness etc. Although the intracerebral origin of the P3 wave is not known, the P3 may have multiple intracerebral generators. The CNV is a slow potential shift occuring during the foreperiod, between warning and response signals, in a reaction time experiment. It is related to expectancy, preparation etc. The abnormal findings of P3 wave and CNV in various psychiatric disorders are also discussed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.283-287
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• 1993

We constructed morphological filter for single sweep records of event-related potential (ERP), especially P300 waveform. By combining 4 basic operations; erosion, dilation, opening and closing, we can derive any desired filters whose property fits the current objectives. The morphological filter for single sweep records of ERP was constructed by taking account of the features of the signal and noise components. The morphological filter has superior properties of separating the signal ancl the noise even existing within a same frequency band. The constructed morphological filter was tested by using simulation data of ERP and then applied to actual ERP data of a normal subject. The results proved that the constructed morphological filter was an appropriate tool for single sweep records of ERP.