서지주요정보
외부에서 주어지는 인위적 자극이 뇌의 정보전달 및 처리기능에 미치는 영향에 관한 연구 = Study on the effects of external stimuli to the information process and transmission in brain function
서명 / 저자 외부에서 주어지는 인위적 자극이 뇌의 정보전달 및 처리기능에 미치는 영향에 관한 연구 = Study on the effects of external stimuli to the information process and transmission in brain function / 한상백.
저자명 한상백 ; Han, Sang-Baek
발행사항 [대전 : 한국과학기술원, 2001].
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등록번호

8012463

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 01018

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초록정보

The main scope of this study is the examination of the brain functions responding to the external stimuli. Adopting both of bottom-up and top-down approach, we investigated the neuron encoding mechanism which is responding to external stimuli and the change of electroencephalogram (EEG) induced by sound and light stimuli. Firstly, the stochastic resonance phenomenon on a single neuron was discussed in numerical and analytical ways. Regarding a neuron as an information processor, we calculate mutual information between the weak input and the output of the Hopfield neuron in noisy environment by using the numerical and the analytical methods. Mutual information shows conventional behavior of stochastic resonance phenomenon regardless of the input being periodic or not, which implies that mutual information can be another measure of stochastic resonance. Furthermore, the analytical investigation shows that the location of the noise strength with the maximum mutual information is not changed with respect to the amplitude of the input signal. Next, we studied the changes in EEG under the application of external sound and light stimuli. Sound and Light Entrainment Devices (SLEDs) have been developed to entrain brain waves based on the fact that photic and/or auditory stimulation of a certain frequency can make brain wave activity fall in synchronization with the frequency of the stimulation. With application of SLED, we examined the changes of the correlation dimension (D2) of EEG. The twelve subjects (6 females and 6 males; age = 13.8 ± 0.6 years) were administered by photic and auditory stimuli of 10Hz frequency by the SLED which corresponds to the alpha frequency of brain waves. We also estimated the spectral dimension of the EEG, which is the generalization of Ω-dimension, defined as the correlation dimension of the band-pass filtered wave from an original multiscaled signal. The calculation of the spectral dimension gives additional information on the properties of the signal like EEG which consists of several components of time series with different dominant frequencies and different sources. We showed that the D2 of the EEG from some channels ($F_3$, $T_4$, $T_6$, $F_{p1}$, $P_3$, and $P_4$) were decreased after application of the SLED, which means that the complexity of the brain dynamics is lowered by SLED. It is also shown from the estimation of the spectral dimension that the alpha band EEG were decreased in complexity after SLED application at channel $F_3$, $T_4$, $T_6$, and $P_4$. The theta band waves are increased in complexity after SLED application at channel $P_4$ and $F_{p1}$. We concluded carefully from this study that the lowered complexity of the EEG induced by SLED may be mainly caused by the decreased complexity of the alpha-band waves. We suggest that the spectral dimension can be helpful to study the mixed signals of multi-components like EEG.

서지기타정보

서지기타정보
청구기호 {DPH 01018
형태사항 vii, 73 p : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, 유한 스텝 확장법 (Finite-step-size expansion). - 2, 이중 안정 포텐셜을 가지는 역학계가 문턱치 근처 크기의 입력 신호를 가질 때 확률 분포 계산
저자명의 영문표기 : Sang-Baek Han
지도교수의 한글표기 : 김수용
지도교수의 영문표기 : Soo-Yong Kim
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 64-73
주제 뇌 기능
잡물공명
뇌파 분석
주파수 차원
brain function
stochastic resonance
EEG
spectral dimension
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