• 제목/요약/키워드: brain stimulation

검색결과 472건 처리시간 0.023초

Investigation of Visual Perception Under Zen-Meditation Based On Alpha-Dependent F-VEPs

  • Liao, Hsien-Cheng;Liu, Chuan-Yi;Lo, Pei-Chen
    • 대한의용생체공학회:의공학회지
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    • 제27권6호
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    • pp.384-391
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    • 2006
  • Variation of brain dynamics under Zen meditation has been one of our major research interests for years. One issue encountered is the inaccessibility to the actual meditation level or stage as a reference. In this paper, we propose an alternative strategy for investigating the human brain in response to external flash stimuli during Zen meditation course. To secure a consistent condition of the brain dynamics when applying stimulation, we designed a recording of flash visual evoked potentials (F-VEPs) based on a constant background EEG (electroencephalograph) frontal $\alpha-rhythm$ dominating activities that increase significantly during Zen meditation. Thus the flash-light stimulus was to be applied upon emergence of the frontal $\alpha-rhythm$. The alpha-dependent F-VEPs were then employed to inspect the effect of Zen meditation on brain dynamics. Based on the experimental protocol proposed, considerable differences between experimental and control groups were obtained. Our results showed that amplitudes of P1-N2 and N2-P2 on Cz and Fz increased significantly during meditation, contrary to the F-VEPs of control group at rest. We thus suggest that Zen meditation results in acute response on primary visual cortex and the associated parts.

The Influence of the Application of NEES to GV20 and L14, on HSP27 and HSP70, after the Ischemic Brain Injury

  • Choi, Jung-Hyun
    • 국제물리치료학회지
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    • 제2권2호
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    • pp.281-287
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    • 2011
  • This research was attempted to seek for a positive approach within the framework of physical therapy instead of the drug treatment in the past, with regard to the ischemic brain injury in the early stage. Accordingly, the aim of this research is to observe the change of HSP27 and HSP70, the genes that are expressed in the early stage of brain injury and to investigate the effects of needle electrode electrical stimulation(NEES), upon applying NEES after ischemia. The experimental method is to give rise to global ischemia and apply NEES to 27 SD-Pat rats with the particulars of being eight-week-old, male, around 300g, and adapted to laboratory environment for more than a week, and divide them into three groups, that is, GV20 NEES group(n=9), L14 NEES group(n=9), no applied NEES global ischemia(GI) group(n=9), and then observe their changes of HSP27 and HSP70 at the time lapse of 6, 9 hr and 12 hr after ischemia, using immunohistochemistry methods. Upon observing through the immunohistochemistry method, it was noticed that there was a significant difference between the GV20 NEES group and the L14 NEES group as for HSP27 and there were significant differences among all groups as for HSP70(p<.05). Accordingly, it is supposed that the application of NEES after the outbreak of cerebral ischemia delay the apoptosis in the early ischemic part of forebrain or protect neurons against apoptosis.

포공영(蒲公英)에 의한 뇌 소교세포에서 산화질소 (NO)의 생성 (Nitric Oxide Production in Brain Microglial Cells by Taraxacum officinale)

  • 임미양;문석재
    • 대한한방내과학회지
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    • 제20권1호
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    • pp.73-82
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    • 1999
  • Nitric oxide (NO) is now recognized as a mediator of several biological and immunological functions, but unlike classical neurotransmitters. NO simply diffuse of the postsynaptic cells and around affecting cells. Taraxacum officinale (Compositae) has been used for maintenance of vitality, and they still occupy an important place in the traditional Korean medicine. We have examined that the effect of Taraxacum officinale water extract on NO synthesis in microglial cells of murine's brain, using the Griess method. And this study was evident that Taraxacum officinale did not induce NO production without recombinant interferon gamma ($rIFN-{\gamma}$), whereas Taraxacum officinale (10-1000 g/ml) with $rIFN-{\gamma}$ effectively produced NO in microglial cells of brain. As result. NO production in microglial cells increased most significantly in dose of 100 g/ml of the Taraxacum officinale and the production of NO was dependent on the dose of Taraxacum officinale, NG-monomethyl-L-arginine, competitive inhibitor of NO synthase, reduced the NO production by Taraxacum officinale stimulation with $rIFN-{\gamma}$ in microglial cells of murine. The effect of Taraxacum officinale was mainly dependent on Taraxacum officinale-induced tumor necrosis factor- secretion. Conclusively, this study suggested that Taraxacum officinale stimulate NO production at microglial cells in brain, which may be an important factor for mediating immune and neuroendocrinologic regulation in nervous system.

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뇌심부자극술 시술환자의 뇌 자기공명영상에서 고주파 출력의 제한기준에 대한 임상적 유용성 평가 (Evaluation of Clinical Usefulness of Radio-Frequency Power Limitation in Brain MRI of Patients with Deep Brain Stimulation)

  • 연규진;장영애;이승근;이태수
    • 방사선산업학회지
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    • 제11권3호
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    • pp.139-144
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    • 2017
  • To evaluation of clinical usefulness for B1+RMS limits, we compared image quality of Routine, Specific absorption rate (SAR) and Root mean square (RMS) protocol. 5 volunteers underwent Magnetic Resonance Imaging (MRI) scan of the brain using three different protocols. We draw Region of interest ROI in cortex, white matter, gray matter, putamen and thalamus of axial plan. Signal to noise ratio (SNR) were evaluated in each area and Contrast to noise ration (CNR) were evaluated between white matter and gray matter. Qualitative evaluation was used to score each ROI. B1+RMS is confirmed its usefulness compared to conventional SAR standard on the aspect of improvement of image quality, reduction of scan time and easy adjusting parameter.

포담환이 Picrotoxin-유도 경련시 뇌중 GABA 및 Glutamate 함량변화에 미치는 영향에 관한 연구 (Study on the Effects of Podam-hwan on Brain GABA and Glutamate Levels in the Picrotoxin-induced Convulsion)

  • 안철효;이원창;구병수
    • 대한한의학회지
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    • 제23권3호
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    • pp.211-222
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    • 2002
  • Currently convulsion is considered to be a chronic central nerve disease characterized by involuntary and severe muscle contraction or spasm. In many recent studies, convulsion's mechanism is due to unbalance between stimulation and suppression of the central nerve system, such as GABA and glutamic acid. Objectives : This study was performed to examine the anticonvulsant effects of Podam-hwan on brain GABA levels and glutamate content in picrotoxin-induced convulsions and to determine the inhibitory activity on GABA transaminase. Methods : Brain GABA levels and glutamate content in the brains of picrotoxin-induced mice using reverse phase HPLC method, anticonvulsant effect in vivo, and the inhibitory effect on GABA transaminase activity in vivo have been investigated. Results : Podam-hwan significantly lengthened the onset time of picrotoxin-induced convulsion at a concentration of 15mg/kg, but did not show a dose-dependent pattern. Also, Podam-hwan shortened the duration of convulsion by 52.2% at a dose of 30mg/kg in comparison with the control group. Podam-hwan inhibited dose-dependently GABA transaminase activity by 35.5% at 30mg/kg, comparing with the control gmup. Podam-hwan also increased the brain GABA level by 38.7% and 68.8% at doses 15mg/kg and 30mg/kg, respectively. In addition, Podam-hwan decreased the brain glutamate level by 9.6% and 17.8% at doses 15mg/kg and 30mg/kg, respectively. Conclusions : Podam-hwan can be prescribed for the treatment of convulsion by enhancement of brain GABA level and inhibition of GABA transaminase activity.

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자기면역성 뇌척수염 조직에서 CPP32의 면역조직화학적 관찰 (Immunohistochemical study of CPP32 (Caspase-3) in the spinal cords of rats with experimental autoimmune encephalomyelitis)

  • 신태균;문창종;안미정;위명복
    • 대한수의학회지
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    • 제40권3호
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    • pp.431-437
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    • 2000
  • The aim of this study was to evaluate the involvement of CPP32 (caspase-3), one of the death-related enzymes, in the course of experimental autoimmune encephalomyelitis (EAE). EAE was induced in Lewis rats immunized with an emulsion of rat spinal cord homogenate with complete Freunds adjuvant supplemented with Mycobacterium tuberculosis (H37Ra, 5mg/ml). The expression of CPP32 in the spinal cords of rats with EAE was studied. In normal rat spinal cords, CPP32 is constitutively, but weakly, expressed in neurons and some neuroglial cells. In the EAE spinal cords, many inflammatory cells were positive for CPP 32, and the majority of CPP32(+) cells were identified as ED1(+) macrophages. During this stage of EAE, the number of CPP32(+) cells in brain cells, including neurons and astrocytes, increased, and these cells also had increased CPP32 immunoreactivity. CPP32 immunor eactivity was not always matched with apoptosis of inflammatory cells in EAE lesions. We speculate that CPP32, which is constitutlvely expressed in brain cells, increases in response to neuroimmunological stimulation in both brain neuronal cells and inflammatory cells. The functional role of CPP32 in neuroimmunological disorders is discussed.

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뇌신경과학 연구 및 기술에 대한 민사법적 대응 (Neurotechnologies and civil law issues)

  • 김수정
    • 의료법학
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    • 제24권2호
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    • pp.147-196
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    • 2023
  • 오늘날에는 기술의 발전으로 인간의 뇌에 직접 자극을 가하여 질병을 치료하거나 뇌파를 통해 직접 기계를 조정하는 것이 가능해졌다. 이러한 뇌신경과학기술은 비침습적으로 이루어질 수도 있으나 적어도 현재까지는 뇌에 직접 전극이나 마이크로칩을 이식하는 침습적 방법이 필요한 자극을 더 정확하게 가하거나 뇌파를 더 정밀하게 측정할 수 있다. 뇌심부자극술(DBS)의 경우 파킨슨병, 본태성진전증에 대해 안정적인 치료방법으로 인정받고 있으며, 그 외 알츠하이머나 우울증 등에도 활용할 수 있는지 연구가 진행중이다. 뇌-컴퓨터 인터페이스(BCI)의 경우 임상단계이지만 신경이 손상되어 신체를 움직이지 못하는 사람들의 신체기능을 대체하거나 재활치료를 지원하는 역할을 할 것으로 기대되고 있다. 문제는 이러한 침습적 뇌신경과학기술을 필요로 하는 사람들의 상당수는 질병 또는 신경 손상으로 인해 판단능력이 손상되어 있거나 의사표시를 제대로 할 수 없는 사람들인데 반해, 이 기술들을 이용한 시술은 고도의 침습적인 시술이어서 반드시 환자 본인의 동의를 필요로 한다는 것이다. 특히 뇌신경과학기술이 아직 임상시험단계에 머물러 있는 영역에서는 위험은 그만큼 커지고 이익은 불확실하기 때문에 이를 고려하여 수술을 받을지 여부를 판단할 수 있도록 더 충분한 설명이 이루어져야 한다. 환자에게 성년후견이 개시되어 있다면 성년후견인이 - 경우에 따라서는 법원의 허가를 받아 - 이 시술에 대한 동의를 대신할 수 있을 것이다. 성년후견이 개시되어 있지 않은 경우 환자의 판단능력이 손상되어 있거나 의사표시를 할 수 없는 경우가 문제이다. 우리 의료 실무에서는 환자가 동의할 수 없는 경우 환자의 보호자에게 동의를 받는 경향이 있지만, 환자의 보호자라는 개념은 우리법상 근거를 찾기 어려운 개념이어서 문제가 있다. 장기적으로는 환자의 배우자나 근친이 보충적으로 환자의 의료행위 동의대행권을 갖도록 법률상 규정하는 편이 타당할 것이다. 뇌신경과학시술을 받은 환자에게 부작용 등 손해가 발생한 경우도 검토를 요한다. 만일 환자에게 수술에 수반되는 위험에 대해 제대로 설명이 되지 않았다면 위자료 청구가 가능하다. 의료과실과 부작용 사이에 인과관계가 있다면 그 부작용에 대해서도 손해배상청구를 할 수 있다. 또한 BCI나 DBS 모두 뇌에 전극이나 마이크로칩등을 이식하고 이를 외부의 컴퓨터를 통해 제어하기 때문에 인체의식형 의료기기가 사용된다. 인체이식형 의료기기에는 제조물책임법이 적용되므로 그 결함으로 인해 부작용이 발생했다고 인정된다면 제조자에 대해서 손해배상을 청구할 수 있다. 최근 우리 의료기기법에는 인체이식형 의료기기 책임보험제도가 시행되어 피해자가 구제를 받을 가능성이 더 강하게 보장된다.

두침과 상하지 침자극이 뇌와 뇌의 체성감각피질에 미치는 영향에 대한 fMRI Study (Effects of Head Acupuncture Versus Upper and Lower Limbs Acupuncture on Signal Activation of Blood Oxygen Level Dependent(BOLD) fMRI on the Brain and Somatosensory Cortex)

  • 박정미;곽자영;조승연;박성욱;정우상;문상관;고창남;조기호;김영석;배형섭;장건호;방재승
    • Journal of Acupuncture Research
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    • 제25권5호
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    • pp.151-165
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    • 2008
  • Objectives : To evaluate the effects of Head Acupuncture versus Upper and Lower Limbs Acupuncture on signal activation of Blood Oxygen Level Dependent(BOLD) fMRI on the Brain and Somatosensory Cortex. Subjects and Methods : 10 healthy normal right-handed female volunteer were recruited. The average age of the 10 subjects was 30 years old. The BOLD functional MRI(fMRI) signal characteristics were determined during tactile stimulation was conducted by rubbing 4 acu-points in the right upper and lower limbs($LI_1$, $LI_{10}$, $LV_3$, $ST_{36}$). After stimulation of Head Acupuncture in Sishencong($HN_1$), $GB_{18}$, $GB_9$, $TH_{20}$ of Left versus Upper and Lower Limbs Acupuncture($LI_1$, $LI_{10}$, $LV_3$, $ST_{36}$ of Right) and took off needles. Then the BOLD fMRI signal characteristics were determined at the same manner. Results : 1. When touched with cotton buds(sensory stimulation), left Parietal Lobe, Post-central Gyrus, primary somatosensory cortex(BA 1, 2, 3), and primary motor cortex(BA 4) were mainly activated. When $ST_{36}$ was stimulated, Frontal Lobe, Parietal Lobe, Cerebellum, and Posterior Lobe as well as Inter-Hemispheric displaying a variety of regions. 2. In signal activation before and after Head Acupuncture reaction, it showed signal activation after removing the acupuncture needle and right Somatosensory Association Cortex, Postcentral Gyrus, and Parietal Lobe were more activated. 3. In reactions of before and after Upper and Lower Limb Acupuncture, it also showed signal activation after removing the acupuncture needle and bilateral Occipital Lobe, Lingual Gyrus, visual association cortex, and Cerebellum were activated. 4. After acupuncture stimulation, In Upper and Lower Limb Acupuncture Group, left frontal Lobe, Precentral Gyrus and Bilateral parietal lobe, Postcentral Gyrus and Primary Somatosensory Cortex(BA 2) were activated. In Head Acupuncture Group, which has most similar activation regions, but especially right Pre-Post central Gyrus, Primary Somatosensory Cortex(BA 3), Primary Motor Cortex, frontal Lobe and Parietal Lobe were activated. Conclusions : When sensory stimulation was done with cotton buds on four acup-points($LI_1$, $LI_{10}4, $LV_3$, $ST_{36}$), while bilaterally activated, contralateral sense was more dominant. It showed consistency with cerebral cortex function. When $ST_{36}$ was stimulated Frontal Lobe, Parietal Lobe, Cerebellum, Posterior Lobe as well as Inter-Hemispheric were stimulated. In Head Acupuncture, it showed more contralateral activation after acupuncture. In Upper and Lower Limb Acupuncture, it showed typically contralateral activation and deactivation of limbic system after acupuncture stimulation. Therefore, there were different fMRI BOLD signal activation reaction before and after Head Acupuncture vs Upper and Lower Limb Acupuncture which might be thought to be caused by acu-points' sensitivity and different sensory receptor to response acupuncture stimulation.

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족삼리(足三里)(St36)의 전침자극(電鍼刺戟)이 fMRI상 뇌활성(腦活性) 변화(變化)에 미치는 영향(影響) (A fMRI study on the cerebral activity induced by Electro-acupuncture on Zusanli(St36))

  • 김영일;김영화;임윤경;이현;이병렬;김연진
    • Journal of Acupuncture Research
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    • 제20권5호
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    • pp.133-150
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    • 2003
  • Objective: Recently. many studies have showed the evidences of the effect of the Electro-acupuncture treatment through scientific. Methods : One of these methods is functional MRI. We performed electro-acupuncture on Zusanli(St36) and observed the change of brain activation using fMRI. Zusanli(St36) is located on the lateral side of the lower leg. 3 cun(寸) inferior to the Patella of the lower border. Theoretically and clinically. this point has been considered very important for gynecological disorders. spleen and stomach disorders. and psychological disorders. To see the effects of electro-acupuncture stimulation on Zusanli(St36). the experiment was carried out on twelve healthy volunteers. using the gradient echo sequence with the 3.0T whole-body fMRI system(ISOL). After the needle insertion on right Zusanli(St36). 2 Hz of electric stimulation was given for 30 seconds. repeated five times. with 30 seconds' intervals. The Image analysis including motion correction. talairach transformation, and smoothing was done with SPM99. Results ad conclusion : The electro-acupuncture stimulation on Zusanli(St36) activates Brodmann Area 6, 13, 2, 19, 21, 22, 39, 40, 38, 3which indicates the pathways of the electro-acupuncture stimulation on Zusanli(St36) and the possibility of the relationship of the electro-acupuncture stimulation on Zusanli(St36) with autonomic nervous system, internal organic system.

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Arm Cortex S3C2440 Microcontroller Application for Transcranial Magnetic Stimulation's Pulse Forming on Bax Reactive Cells and Cell Death in Ischemia Induced Rats

  • Tac, Han-Ho;Kim, Whi-Young
    • Journal of Magnetics
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    • 제21권2호
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    • pp.266-272
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    • 2016
  • Transcranial magnetic stimulation devices has been used mainly for diagnostic purposes by measuring the functions of the nervous system rather than for treatment purposes, and has a problem of considerable energy fluctuations per repeated pulse. The majority of strokes are caused by ischemia and result in brain tissue damage, leading to problems of the central nervous system including hemiparesis, dysfunction of language and consciousness, and dysfunction of perception. Control is difficult and the size is large due to the difficulty of digitalizing the energy stored in a capacitor, and there are many heavy devices. In addition, there are many constraints when it is used for a range of purposes such as head and neck diagnosis, treatment and rehabilitation of nerve palsy, muscle strengthening, treatment of urinary incontinence etc. Output stabilization and minimization of the energy variation rate are required as the level of the transcranial magnetic stimulation device is dramatically improved and the demand for therapeutic purposes increases. This study developed a compact, low cost transcranial magnetic stimulation device with minimal energy variation of a high repeated pulse and output stabilization using a real time capacitor charge discharge voltage. Ischemia was induced in male SD rats by closing off the common carotid artery for 5 minutes, after which the blood was re-perfused. In the cerebrum, the number of PARP reactive cells after 24 hours significantly decreased (p < 0.05) in the TMS group compared to the GI group. As a result, TMS showed the greatest effect on necrosis-related PARP immuno-reactive cells 24 hours after ischemia, indicating necrosis inhibition, blocking of neural cell death, and protection of neural cells.