Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.最新文献_第10页

Force Tracking System for Training of Hand Function in Stroke Patients 用于脑卒中患者手功能训练的力跟踪系统

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419653

G. Kurillo, N. Goljar, T. Bajd

引用次数: 2

Quanti cation of movement regularity during internally generated and externally cued repetitive movements in patients with Parkinson's disease. 帕金森病患者内源性和外源性重复性运动中运动规律的定量分析。

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419612

L. Myers, C. MacKinnon

{"title":"Quanti cation of movement regularity during internally generated and externally cued repetitive movements in patients with Parkinson's disease.","authors":"L. Myers, C. MacKinnon","doi":"10.1109/CNE.2005.1419612","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419612","url":null,"abstract":"Clinical tests used to rate the severity of bradykinesia in patients with Parkinson's disease generally involve self-initiated and self-maintained repetitive movements (e.g. finger-tapping). This is based on evidence that movement impairment is exacerbated by the removal of external timing cues or performance feedback (i.e. internally generated movements). Typically performance is rated subjectively by a clinician and is based on observation. Currently no clear means of quantifying the performance of these types of repetitive movements exist. Here we evaluate candidate measures that assess the amount and structure of the variability in the movements respectively. These measures are the sample entropy, which quantifies the degree of irregularity in a signal and the standard deviation which quantifies the spread or variability in the signal. This was tested under three different conditions: (1) slow versus fast repetitive movements; (2) externally cued versus internally cued movements; and (3) movements performed before and after the administration of antiparkinsonian medications. Entropy and variability were calculated for both acceleration and EMG signals. The results suggest that internally cued movements are more irregular than externally cued movements and that both regularity and variability in amplitude increase with antiparkinsonian medications. We conclude that the sample entropy is an effective means of objectively quantifying the performance of repetitive movements","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"9 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117225563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Targeted muscle reinnervation for improved myoelectric prosthesis control 靶向肌肉神经移植改善肌电假体控制

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419642

T. Kuiken, G. Dumanian, Robert D. Lipschutz, L. Miller, K. Stubblefield

{"title":"Targeted muscle reinnervation for improved myoelectric prosthesis control","authors":"T. Kuiken, G. Dumanian, Robert D. Lipschutz, L. Miller, K. Stubblefield","doi":"10.1109/CNE.2005.1419642","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419642","url":null,"abstract":"A novel method for the control of myoelectric upper limb prostheses has been developed. By transferring the residual nerves of amputees to spare muscles in or near the residual limb, additional myoelectric control signals are made that allow the simultaneous control of multiple degrees-of-freedom in the prostheses. Since the nerve function correlates physiologically to the function it is controlling in the prosthesis, operation is more natural and thus easier than current control paradigms. The procedure has been successfully employed in two amputees. A patient with traumatic bilateral shoulder disarticulation amputations had four brachial plexus nerves transferred onto denervated pectoralis muscle segments. Four independent new myosites were created that allowed for simultaneous control of two degrees-of-freedom with shoulder movement still available for a third degree-of-freedom. Objective testing showed a doubling of blocks moved with a box and blocks test and a 26% increase in speed with a clothes pin moving test. Furthermore, the skin of the anterior chest was reinnervated with sensory fibers from the patient's hand and arm. A second patient with a long transhumeral amputation had his median nerve transferred on to a denervated medial biceps and his distal radial nerve transferred on to his brachialis muscle. Both nerves successfully reinnervated the respective muscles. This patient was then also able to simultaneously use myoelectric control for a powered elbow and hand, and simultaneously controlled wrist rotation with shoulder motion for a total of three degrees-of-freedom. Objective testing showed over a three-fold improvement of speed with the block and box test and significant improvement with AMPS testing. Skin sensory reinnervation did not occur. These patients demonstrate the potential for targeted muscle reinnervation to improve the function of powered artificial limbs and possibly provide unique and valuable sensory feedback to the amputee","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124531371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Classification of Motor Imagery Tasks by means of Time-Frequency-Spatial Analysis for Brain-Computer Interface Applications 基于时频空分析的运动想象任务分类在脑机接口中的应用

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419636

L. Qin, B. Kamousi, Z.M. Liu, L. Ding, B. He

引用次数: 10

Brain Computer Interface Design Using Band Powers Extracted During Mental Tasks 利用脑力任务中提取的波段能量设计脑机接口

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419622

Ramaswamy Palaniappan

{"title":"Brain Computer Interface Design Using Band Powers Extracted During Mental Tasks","authors":"Ramaswamy Palaniappan","doi":"10.1109/CNE.2005.1419622","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419622","url":null,"abstract":"In this paper, a brain computer interface (BCI) is designed using electroencephalogram (EEG) signals where the subjects have to think of only a single mental task. The method uses spectral power and power difference in 4 bands: delta and theta, beta, alpha and gamma. This could be used as an alternative to the existing BCI designs that require classification of several mental tasks. In addition, an attempt is made to show that different subjects require different mental task for minimising the error in BCI output. In the experimental study, EEG signals were recorded from 4 subjects while they were thinking of 4 different mental tasks. Combinations of resting (baseline) state and another mental task are studied at a time for each subject. Spectral powers in the 4 bands from 6 channels are computed using the energy of the elliptic FIR filter output. The mental tasks are detected by a neural network classifier. The results show that classification accuracy up to 97.5% is possible, provided that the most suitable mental task is used. As an application, the proposed method could be used to move a cursor on the screen. If cursor movement is used with a translation scheme like Morse code, the subjects could use the proposed BCI for constructing letters/words. This would be very useful for paralysed individuals to communicate with their external surroundings","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"58 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123299832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 119

Modeling and simulation of electric fields generated by brain stimulation electrodes: the effect of cystic cavities in the basal ganglia 脑刺激电极产生电场的建模与模拟:基底神经节囊腔的影响

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419590

M. Astrom, J. Johansson, K. Wårdell

{"title":"Modeling and simulation of electric fields generated by brain stimulation electrodes: the effect of cystic cavities in the basal ganglia","authors":"M. Astrom, J. Johansson, K. Wårdell","doi":"10.1109/CNE.2005.1419590","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419590","url":null,"abstract":"Deep brain stimulation (DBS) is an effective method for managing movement disorders. A small electrode is implanted in the basal ganglia and an electric potential is applied to one or more active elements of the electrode in order to simulate the neurons in the surrounding tissue. The fundamental understanding of the mechanisms responsible for the therapeutic DBS effects is unknown. A method to increase the knowledge is to use computer simulations. In this study the finite element method has been used for investigation of relative changes of the electrical field extension surrounding a monopolar DBS-electrode positioned in gray matter. Due to the frequently appearing cystic cavities in globus pallidus and putamen a nucleus of gray matter with and without a cerebrospinal fluid filled cystic cavity was modeled. The simulations demonstrated an electrical field around the active element with decreasing values in the radial direction. A stepwise change was present at the edge between gray and white matter. The cyst increased the radial extension and changed the shape of the field. This may result in closely related unexpected structures being stimulated and could be one of the reasons of reported postoperative complications","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115846078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Implanted Upper Extremity Neuroprosthesis Utilizing Myoelectric Control 利用肌电控制的植入式上肢神经假体

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419634

K. Kilgore, P. H. Peckham, F. Montague, R. Hart, A. Bryden, Michael W. Keith, H. Hoyen, N. Bhadra

{"title":"An Implanted Upper Extremity Neuroprosthesis Utilizing Myoelectric Control","authors":"K. Kilgore, P. H. Peckham, F. Montague, R. Hart, A. Bryden, Michael W. Keith, H. Hoyen, N. Bhadra","doi":"10.1109/CNE.2005.1419634","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419634","url":null,"abstract":"Neuroprostheses use electrical stimulation of paralyzed muscles to produce controlled limb movement. A first generation implanted neuroprosthesis for upper extremity function underwent a successful multi-center clinical trial and received FDA approval in 1997. We have now developed a family of second generation implanted neuroprosthetic systems. These systems provide control of grasp-release, forearm pronation, and elbow extension for individuals with cervical level spinal cord injury. The key feature of the advanced system is the capability to transmit data out of the body, allowing the use of implanted control sensors, thus minimizing the required external components. Clinical studies have been initiated with a second generation neuroprosthesis that consists of twelve stimulating electrodes, two myoelectric signal recording electrodes, an implanted stimulator-telemeter device and an external control unit and transmit/receive coil. This system has now been implemented in three C5/C6 spinal cord injured individuals, including one subject with bilateral implants. The results from these three subjects demonstrate that myoelectric signals can be recorded from voluntary muscles in the presence of electrical stimulation of nearby muscles. Myoelectric signals can be used for both discrete and proportional control signals. The results to date are promising, and all subjects have demonstrated improved function using the implanted neuroprosthesis","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116013502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Complexity-based Analysis of the Dynamic of Propagation of Epileptic Seizures 基于复杂性的癫痫发作传播动态分析

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419577

C. Jouny, P. Franaszczuk, G. Bergey

引用次数: 2

Simulation of Intramuscular EMG Signal Detection using Implantable MyoElectric Sensors 用植入式肌电传感器模拟肌内肌电信号检测

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419632

M. Lowery, R. Weir, T. Kuiken

{"title":"Simulation of Intramuscular EMG Signal Detection using Implantable MyoElectric Sensors","authors":"M. Lowery, R. Weir, T. Kuiken","doi":"10.1109/CNE.2005.1419632","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419632","url":null,"abstract":"The volume conduction of intramuscular EMG signals recorded using implanted electrodes was examined using model simulation. Local effects due to electrode geometry, material properties including fibrocollagenous encapsulation tissue, and electrode orientation were investigated. Muscle fiber and motor unit action potentials were simulated using two different volume conductor models a finite element (FE) model that was used to explore the influence of the surrounding tissue properties, and an analytical infinite volume conductor model, used to explore the approximate pick-up volume of the electrode. The amplitude of simulated action potentials progressively increased as the conducting electrode poles, non-conducting electrode casing and highly resistive encapsulation tissue were added to the model. The pick-up volume of the electrode was estimated by simulating muscle fiber action potentials from 20,000 muscle fibers randomly located throughout the muscle. Changing the orientation of the electrode with respect to the fiber direction reduced the selectivity of the electrode and altered the shape of the pick-up volume. As the angle of rotation was increased from 0deg to 22.5deg and 45deg, the pick-up volume of the electrode and the shape of the surrounding isopotential contours became progressively wider and flatter. The estimated pick-up range of the IMES electrode, assuming a cylindrical muscle, was 4.8 mm, 6.2 mm and 7.5 mm for electrode orientations of 0deg, 22.5deg and 45deg, respectively","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130975754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Functional Changes in Sensorimotor Regions of the Brain Following Spinal Injury 脊髓损伤后大脑感觉运动区的功能变化

Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005. Pub Date : 2005-03-16 DOI: 10.1109/CNE.2005.1419548

K. Moxon, A. Melisiotis, G. Foffani

{"title":"Functional Changes in Sensorimotor Regions of the Brain Following Spinal Injury","authors":"K. Moxon, A. Melisiotis, G. Foffani","doi":"10.1109/CNE.2005.1419548","DOIUrl":"https://doi.org/10.1109/CNE.2005.1419548","url":null,"abstract":"Neurorobotics has been successfully used as novel output pathway for patients with severe nerve damage including spinal injury. However, a spinal injury is also a brain injury and it is difficult to assess the mechanisms that allow the injured brain to control an external device such as a cursor on a computer screen. We have therefore been using a rat model of spinal cord injury to assess functional changes in the sensorimotor regions of the brain to spinal cord injury. Arrays of microelectrodes were chronically implanted into the sensorimotor region of the brain and used to monitor neuronal activity before and after spinal cord hemisection. Neurons were recorded while the animal performed a spontaneous reaching task. Population functions were generated to identify forepaw contact and the ability to accurately identify contact on a single trial basis was used as a measure of the ability of the neural circuits to code for sensorimotor motor output. Our data suggest that while there was a significant decrease in the response of these neurons to passive stimulation of their receptive fields after spinal lesion and microstimulation was no longer able to generate coordinated muscle contraction, the population function was able to predict paw contact during spontaneous reaching. Furthermore, the latency of the peak of the response for single trial contact was significantly earlier post-hemisection compared to pre-hemisection. These results are discussed in terms of how they relate to strategies used by the animal to compensate for the loss of passive sensory stimulation","PeriodicalId":113815,"journal":{"name":"Conference Proceedings. 2nd International IEEE EMBS Conference on Neural Engineering, 2005.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131729977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1