Artificial muscle activation by electrical stimulation of motor nerves is characterized by poor force gradation and a relative fast onset of muscle fatigue. Force gradation would improve and the onset of fatigue would be delayed by primarily activating the small-diameter motoneurons. In this study the effects of selective small fiber activation stimulation was investigated in an acute rabbit mo...

In this paper, multilevel techniques are introduced as a fast numerical method to compute 3-D potential field in nerve stimulation configurations. It is shown that with these techniques the computing time is reduced significantly compared to conventional methods. Consequently, these techniques greatly enhance the possibilities for parameter studies and electrode design. Following a general desc...

The present study evaluated tripolar stimulating electrodes for eliciting dopamine release in the rat brain in vivo. Stimulating electrodes were placed either in the medial forebrain bundle or in the ventral mesencephalon associated with the ventral tegmental area and substantia nigra. The concentration of extracellular dopamine was monitored in dopamine terminal fields at 100-ms intervals usin...

introduction: the claustrum interconnects with the allocortical and neocortical regions and also projects to the hippocampus and the amygdala. .the role of claustrum in the complex partial seizure is not clear. thus in this study the effect of amygdala lesion on anterior claustrum kindled seizures in rat were investigated. methods: male wistar rats, weighting 250-300 g, were received dc current...

Functional Electrical Stimulation (FES) may be improved by the use of naturally occurring nerve signals as feedback signals. However, the usefulness of the recorded electroneurogram (ENG) signals from nerve cuff electrodes depends on the amount of electromyogram (EMG) interference and stimulus artefact present. Tripolar cuff electrodes reduce interference but suffer from imbalance, which degrad...

In multichannel cochlear implants (CIs), current is delivered to specific electrodes along the cochlea in the form of amplitude-modulated pulse trains, to convey temporal and spectral cues. Our previous studies have shown that focused multipolar (FMP) and tripolar (TP) stimulation produce more restricted neural activation and reduced channel interactions in the inferior colliculus (IC) compared...

We calculated the electric fields induced in the brain during transcranial current stimulation (TCS) using a finite-element concentric spheres human head model. A range of disc electrode configurations were simulated: (1) distant-bipolar; (2) adjacent-bipolar; (3) tripolar; and three ring designs, (4) belt, (5) concentric ring, and (6) double concentric ring. We compared the focality of each co...

introduction: effect of tripolar tens of vertebral column on slow and fast motoneurons (mns) activity of soleus muscle was previously investigated. in this study for better differentiation of the behavior of slow and fast mns, we exploited h-reflex recovery curve recording in two muscles of soleus and lateral gastrocnemius, respectively as the representatives of slow and fast muscles. methods: ...

AIM Electrical stimulation of the dorsal column of the spinal cord stands out as a major method of neuromodulation. Its popularity stems from the long lasting support to the "gate theory" in which electrical stimulation of the gate prevents passage of nociceptive impulses and reduces pain sensation. There is little known about the effect of the duration of intraoperative stimula...