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经颅直流电刺激对失写症书写功能的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
目的:观察经颅直流电刺激(tDCS)对失写症书写功能的影响,为tDCS治疗失写症提供依据。方法:对1例左顶叶梗死后(7个月)Gerstmann(综合征)失写症患者进行10次书写训练和10次书写训练加tDCS治疗。tDCS阳极刺激部位为左侧顶叶(国际脑电图10—20系统电极放置法,P3导联位置),阴极放置于对侧肩部;每日一次,每次20min。治疗前后应用汉语失语证心理语言评价对患者进行语言功能检查。结果:书写训练前语言评价显示患者的字形输出词典和字形输出缓冲模块受损。单纯书写训练前后,患者的听写、看图书写、自发书写的正确率无明显改变。书写训练加tDCS治疗后,患者的听写、看图书写、自发书写的正确率显著改善(P<0.05);书写错误,如部件替代、遗漏,笔画遗漏和无反应明显减少(P<0.05),延迟抄写接近正常。结论:tDCS阳极刺激左侧顶叶可以提高Gerstmann综合征失写患者的书写能力,即改善患者的字形输出词典和字形输出缓冲的功能。tDCS为失写症的康复提供了一种新的治疗技术。  相似文献
2.
经颅磁刺激与经颅直流电刺激的比较   总被引:1,自引:0,他引:1  
对经颅磁刺激和经颅直流电刺激技术在基本原理、安全性、脑功能检测、临床应用治疗方面进行比较,以便于合理地选择和有效利用这两种方法。  相似文献
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摘要 目的:研究经颅直流电刺激(tDCS)改善卒中后共济失调型吞咽障碍的疗效。 方法:采用随机对照设计,将30例卒中后共济失调型吞咽障碍患者随机分为tDCS组和对照组,各15例。在外周经皮电刺激治疗的基础上,tDCS组进行小脑tDCS治疗,而对照组进行小脑tDCS假刺激治疗。比较两组患者治疗前、后的改良吞咽障碍能力评价表和吞咽障碍严重程度的变化。 结果:治疗前,两组患者的改良Masa吞咽能力评价和吞咽障碍严重程度分级的差异无显著性(P>0.05)。治疗后,tDCS组和对照组的改良吞咽障碍能力评价和吞咽障碍严重程度分级值均有显著改善(P<0.05),而且tDCS组的改善程度明显优于对照组(P<0.05)。 结论:小脑阳极tDCS配合外周经皮电刺激治疗,可以更为明显地改善卒中后共济失调型吞咽障碍患者的吞咽功能,为共济失调型吞咽障碍的治疗提供了新的手段。  相似文献
5.
Transcranial direct current stimulation (tDCS) effectively modulates cortical excitability. Several studies suggest clinical efficacy in chronic pain syndromes. However, little is known regarding its effects on cortical pain processing. In this double-blind, randomized, cross-over, sham controlled study, we examined the effects of anodal, cathodal, and sham stimulation of the left motor cortex in 16 healthy volunteers using functional imaging during an acute heat pain paradigm as well as pain thresholds, pain intensity ratings, and quantitative sensory testing. tDCS was applied at 1 mA for 15 minutes. Neither cathodal nor anodal tDCS significantly changed brain activation in response to nociceptive stimulation when compared with sham stimulation. However, contrasting the interaction of stimulation modes (anodal/cathodal) resulted in a significant decrease of activation in the hypothalamus, inferior parietal cortex, inferior parietal lobule, anterior insula, and precentral gyrus, contralateral to the stimulation site after anodal stimulation, which showed the opposite behavior after cathodal stimulation. Pain ratings and heat hyperalgesia showed only a subclinical pain reduction after anodal tDCS. Larger-scale clinical trials using higher tDCS intensities or longer durations are necessary to assess the neurophysiological effect and subsequently the therapeutic potential of tDCS.  相似文献
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摘要 目的:探查左侧Broca区阳极和Broca右侧对应区阴极经颅直流电刺激(tDCS)对脑卒中后失语症患者图命名是否有促进作用,两者的促进作用是否有差异。 方法:对29例额叶及基底核区脑卒中后(2—12个月)失语症患者进行图命名检查的同时,实施在线左侧Broca区阳极、Broca右侧对应区阴极tDCS,其检查结果与假刺激图命名检查结果对照。三种实验条件间隔时间≥24h。左右侧tDCS随机实施。 结果:尽管部分患者显示右侧对应区阴极tDCS可以提高图命名成绩,但是只有左侧Broca区阳极tDCS可以显著改善失语症患者的图命名能力(P<0.05)。 结论:增强左Broca区皮质的兴奋性,可以促进失语症患者图命名能力的改善;左Broca区及其周围区在脑卒中后失语症患者的语言恢复中仍起着重要作用。  相似文献
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Neuropathic pain remains one of the most difficult consequences of spinal cord injury (SCI) to manage. It is a major cause of suffering and adds to the physical, emotional, and societal impact of the injury. Despite the use of the best available treatments, two thirds of people experiencing neuropathic pain after SCI do not achieve satisfactory pain relief. This study was undertaken in response to a recent clinical trial reporting short-term, clinically significant reductions in neuropathic SCI pain with primary motor cortex transcranial direct current stimulation (tDCS). In this investigation, we aimed to build on this previous clinical trial by extending the assessment period to determine the short-, medium-, and long-term efficacy of tDCS for the treatment of neuropathic pain after SCI. We found that, contrary to previous reports, after 5 tDCS treatment periods, mean pain intensity and unpleasantness rating were not significantly different from initial assessment. That is, in this trial tDCS did not provide any pain relief in subjects with neuropathic SCI pain (n = 10). A similar lack of effect was also seen after sham treatment. Because the injury duration in this study was significantly greater than that of previous investigations, it is possible that tDCS is an effective analgesic only in individuals with relatively recent injuries and pain. Future investigations comparing a range of injury durations are required if we are to determine whether this is indeed the case.  相似文献
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The accurate identification of obscured and concealed objects in complex environments was an important skill required for survival during human evolution, and is required today for many forms of expertise. Here we used transcranial direct current stimulation (tDCS) guided using neuroimaging to increase learning rate in a novel, minimally guided discovery-learning paradigm. Ninety-six subjects identified threat-related objects concealed in naturalistic virtual surroundings used in real-world training. A variety of brain networks were found using functional magnetic resonance imaging (fMRI) data collected at different stages of learning, with two of these networks focused in right inferior frontal and right parietal cortex. Anodal 2.0 mA tDCS performed for 30 min over these regions in a series of single-blind, randomized studies resulted in significant improvements in learning and performance compared with 0.1 mA tDCS. This difference in performance increased to a factor of two after a one-hour delay. A dose-response effect of current strength on learning was also found. Taken together, these brain imaging and stimulation studies suggest that right frontal and parietal cortex are involved in learning to identify concealed objects in naturalistic surroundings. Furthermore, they suggest that the application of anodal tDCS over these regions can greatly increase learning, resulting in one of the largest effects on learning yet reported. The methods developed here may be useful to decrease the time required to attain expertise in a variety of settings.  相似文献
9.
This paper proposes a shift in the way researchers currently view and use transcranial brain stimulation technologies. From a neuroscience perspective, the standard application of both transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS) has been mainly to explore the function of various brain regions. These tools allow for noninvasive and painless modulation of cortical tissue. In the course of studying the function of an area, many studies often report enhanced performance of a task during or following the stimulation. However, little follow-up research is typically done to further explore these effects. Approaching this growing pool of cognitive neuroscience literature with a neuroergonomics mindset (i.e., studying the brain at work), the possibilities of using these stimulation techniques for more than simply investigating the function of cortical areas become evident. In this paper, we discuss how cognitive neuroscience brain stimulation studies may complement neuroergonomics research on human performance optimization. And, through this discussion, we hope to shift the mindset of viewing transcranial stimulation techniques as solely investigatory basic science tools or possible clinical therapeutic devices to viewing transcranial stimulation techniques as interventional tools to be incorporated in applied science research and systems for the augmentation and enhancement of human operator performance.  相似文献
10.
经颅直流电刺激是一种无创性大脑皮层刺激方法。本文简要回顾其起源和发展,着重综述其机制。目前观点认为,经颅直流电刺激可能通过改变皮层兴奋性、增加突触可塑性、影响皮质兴奋/抑制平衡、改变局部脑血流、调节局部皮层和脑网联系等途径发挥调节脑功能的作用。本文通过比较分析相关文献、总结研究结果,提出要取得理想的刺激效果,仍有待深入探讨的两个问题,即刺激参数的选择及经颅直流电刺激与任务执行的时间关系。  相似文献
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