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The aim of this paper is to compare three recording methods for interference rejection from tripolar nerve cuffs by testing in a saline-filled tank. The three methods were: the quasi-tripole (QT), the modified-quasi-tripole (mQT) and adjusted true tripole (aTT). When the interfering electric field that surrounds the cuff is solonoidal and coaxial with the cuff, the mQT allows the interference that...
Exposure to time-varying magnetic fields evokes two effects in biological tissue: Firstly, an electric field is induced that generates eddy currents in conductive tissues, and, secondly, power deposit might increase local temperatures. Field effects of frequencies up to 1 kHz and above 1 MHz are well known. The intermediate frequency range lacks intensive research. Only little attention has been paid...
During the last decade there has been a renewed interest in the development of advanced, active hand prosthetic devices for amputees. In contrast to passive prostheses, active devices can be controlled by the user's intention. Active prosthetic devices have been substantially improved by integrating robot technology to achieve more functionalities and lifelike movements. Despite important progress...
Neural electrodes represent the direct interface between the biological and the electronic system. Electrodes are used for both recording of neural signals and stimulation of nerves and muscles. It is critical that the electrode material is biocompatible and electrically and mechanically stable so that the electrode neither dissolve/degrade while stimulation of neural tissue, nor change its properties...
The purpose of this study is to support communication of individuals with motor paralysis having difficulty verbally communicating due to illnesses such as Guillain-Barre Syndrome or brain-stem infarction. We have developed and describe a pointing device controlled by DC-coupled electrooculograms (EOGs). The visual angle of the subject is estimated from the amplitude of vertical and horizontal EOGs...
Motor unit (MU) properties of the biceps brachii and Fugl-Meyer score were assessed in stroke patients and healthy controls during passive and active elbow flexion and extension contractions. The level of motor recovery as assessed with the Fugl-Meyer score was correlated with the ratio of the size of the motor unit action potentials (MUAPs) at the affected side and the unaffected side. This ratio...
A vertical movement stimulus has been applied to 10 healthy subjects in the prone position and recordings of the vestibular responses made using an EVestG configuration. The response encoding has been examined using a novel Neural Event Extraction Routine (NEER) developed to detect otoacoustic field potentials. The potential measures 1. average field potential amplitude and 2. average number of field...
We report applications of sub-5 μm diameter silicon microprobes and silicon dioxide microtubes fabricated by vapor-liquid-solid method and microfabrication techniques, to use in in-vivo animal experiments. Before animal experiments, electrical impedance and test signal detection via the microprobe electrode were investigated. According to the results, electrical impedance at 1 kHz is approximately...
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