Remote vibrotactile noise improves light touch sensation in stroke survivors' fingertips via stochastic resonance
Remote vibrotactile noise improves light touch sensation in stroke survivors' fingertips via stochastic resonance
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DOI：
10.1186/1743-0003-10-105
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发表时间：
2013-10-11
影响因子：
5.1
通讯作者：
Seo, Na Jin
中科院分区：
文献类型：
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作者：
Enders, Leah R.;Hur, Pilwon;Seo, Na Jin
背景和目的：脑卒中的康复往往不能将感觉和运动的恢复结合起来。虽然阈下噪声被证明可以增强噪声施加部位的感觉信号检测，但在指尖处具有噪声生成装置以增强指尖感觉并潜在地增强中风幸存者的灵巧性是不切实际的，因为该装置会干扰物体操纵。本研究确定，如果远程应用阈下振动触觉噪声（远离指尖），提高指尖触觉与潜在的，以提高灵活性为中风survivor.Methods：食指和拇指垫的感觉，测量了10个中风幸存者与指尖感觉缺损使用Semmes-Weinstein单丝和两点辨别测试。感觉评分是用三种强度的噪音来测量的（40%，60%，80%的感觉阈值）的麻痹上肢的四个位置之一（食指关节近侧的手背、拇指关节近侧的手背、背侧腕、掌侧腕），结果：所有强度和位置的振动触觉噪声瞬时显著改善了食指指尖和拇指尖的单丝分数（p <0.01）。没有显着的影响，噪音被视为两点辨别力测试scores.Conclusions：远程应用阈下（难以察觉的）振动触觉噪音在手腕和手背瞬间改善中风幸存者的光触觉，独立的噪音的位置和强度。腕部和手背的振动触觉噪声可能通过随机共振和神经元间联系增强了指尖的轻触感觉。虽然噪音对中风患者的长期益处值得进一步研究，但这一结果表明，在手腕处施加振动触觉噪音的可穿戴设备可以增强感觉和抓握能力，而不会干扰日常任务中的物体操作。
Background and purpose: Stroke rehabilitation does not often integrate both sensory and motor recovery. While subthreshold noise was shown to enhance sensory signal detection at the site of noise application, having a noise-generating device at the fingertip to enhance fingertip sensation and potentially enhance dexterity for stroke survivors is impractical, since the device would interfere with object manipulation. This study determined if remote application of subthreshold vibrotactile noise (away from the fingertips) improves fingertip tactile sensation with potential to enhance dexterity for stroke survivors.Methods: Index finger and thumb pad sensation was measured for ten stroke survivors with fingertip sensory deficit using the Semmes-Weinstein Monofilament and Two-Point Discrimination Tests. Sensation scores were measured with noise applied at one of three intensities (40%, 60%, 80% of the sensory threshold) to one of four locations of the paretic upper extremity (dorsal hand proximal to the index finger knuckle, dorsal hand proximal to the thumb knuckle, dorsal wrist, volar wrist) in a random order, as well as without noise at beginning (Pre) and end (Post) of the testing session.Results: Vibrotactile noise of all intensities and locations instantaneously and significantly improved Monofilament scores of the index fingertip and thumb tip (p < .01). No significant effect of the noise was seen for the Two-Point Discrimination Test scores.Conclusions: Remote application of subthreshold (imperceptible) vibrotactile noise at the wrist and dorsal hand instantaneously improved stroke survivors' light touch sensation, independent of noise location and intensity. Vibrotactile noise at the wrist and dorsal hand may have enhanced the fingertips' light touch sensation via stochastic resonance and interneuronal connections. While long-term benefits of noise in stroke patients warrants further investigation, this result demonstrates potential that a wearable device applying vibrotactile noise at the wrist could enhance sensation and grip ability without interfering with object manipulation in everyday tasks.