This study has shown that an electrode array can be passed along the hold length of the cochlea if it is inserted through and opening in the scala tympani of the apical turn. The electrode must have the appropriate mechanical properties and some of these were stiffness and extensibility. The electrode and operative approach should be helpful in stimulating the terminal auditory nerve fibres on ...

A series of animal experiments was conducted to characterize changes in the complex impedance of chronically implanted electrodes in neural tissue. Consistent trends in impedance changes were observed across all animals, characterized as a general increase in the measured impedance magnitude at 1 kHz. Impedance changes reach a peak approximately 7 days post-implant. Reactive responses around in...

The results of electrical stimulation of the insect supraoesophageal ganglion have been reported by Huber (i960A and previous works) from acute preparations of Gryllus. The present study is centred around a technique of cerebral stimulation which augments this work in two ways: first, by using a different species, Schistocerca gregaria, the desert locust, and secondly by providing a method of s...

OOKAWA and GoTOH8,9,10)have studied the surface electroencephalogram (EEG)of chickens by the chronic experimental method and determined its normal patterns from wakefulness to sleeping and the effect of anesthesia on EEG. In their experiments,electric activity revealed many interesting characters, including phase reversals at certain regions of the brain. The phase reversal mentioned above,was ...

1. The neural activity of the nerve cord of Hirudo medicinalis has been recorded in unrestrained animals by means of chronically implanted electrodes. 2. The Fast Conducting System (FCS) is inactive both in motionless animals and during various kinds of active behaviour (creeping, swimming, ventilation). 3. Photic and tactile stimuli applied to a motionless animal elicit a FCS discharge, which ...

Decoding motor intent from recorded neural signals is essential for the development of effective neural-controlled prostheses. To facilitate the development of online decoding algorithms we have developed a software platform to simulate neural motor signals recorded with peripheral nerve electrodes, such as longitudinal intrafascicular electrodes (LIFEs). The simulator uses stored motor intent ...

background: in several conditions we have face cranial bone defects. reconstruction of these defects remains one of the most challenging problems encountered by craniofacial surgeons.   objective: to evaluate bone repair in cranial bone defects by use of an implant made of octacalcium phosphate in combination with bone matrix gelatin (ocp/bmg).   methods: we used 40, 5–6-week-old male sprague-d...

In previous studies of brain transplantation, the fate of the implanted glial cells has been investigated separately; that is, the interest has been focused either on the astroglia or on the oligodendroglia. However, the two populations of implanted glial cells may interact with each other, for example by secreting species-specific factors or by inducing reactions by the host. We have used two ...

Objectives: This study examined the relationship between working and short-term memory performance, and their effects on cochlear implant outcomes (speech perception and speech production) in cochlear implanted children aged 7-13 years. The study also compared the memory performance of cochlear implanted children with their normal hearing peers. Methods: Thirty-one cochlear impl...

The magnetic properties were investigated for C- and P-implanted MgO single crystals, which irradiated by 80 keV C P ions with the dose of 3 × 1017 ions/cm2. pristine apparently changed ion implantation. Room temperature ferromagnetism was presented in C-implanted sample, while sample only displayed paramagnetism at 20 K. For purpose clarifying correlation between microstructure, a comparative ...