Klaus Ehrenberger

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The results of immunocytochemical, enzymatic and electrophysiological studies have indicated that acetylcholine and GABA may act as neurotransmitters in lateral olivocochlear efferent endings on inner hair cell afferent dendrites. Since spike activity can be recorded in the dendritic region of inner hair cells, microiontophoretic techniques were used(More)
The inhibitory neurotransmitter gamma-aminobutyric acid (GABA) is mediated by two main categories of receptors: the GABA(A) and GABA(B) receptor. Recent immunocytochemical and electron microscopical studies revealed the existence of GABA at the efferent olivocochlear innervation of the guinea pig cochlea. In this microiontophoretic study we examined the(More)
AIMS The aim of this study was to compare laser surgery, conventional endoscopic surgery and radiotherapy in the treatment of early T1a glottic cancer. METHODS We conducted a retrospective analysis of patients with early vocal cord cancer (who underwent either conventional surgery via endoscopy or laryngofissur, or primary radiotherapy) at the Medical(More)
With the aid of microiontophoretic techniques we evaluated the action of different postsynaptic glutamate receptor subtypes that mediate neurotransmission between the inner hair cell and the afferent neuron. The sensory input is modulated by axodendritic efferents. In the central nervous system, excessive activation of glutamate receptors is thought to be(More)
The present multicentric clinical study involves 19 centres, 16 of them in German-speaking countries, 1 British, 1 Polish and 1 Hungarian. 60 postlingually deafened adults with a mean age of 47.5 years (20-70) and mean duration of deafness of 5.3 years (0.5-20) have been evaluated with the MED-EL COMBI 40 cochlear implant which implements a high-rate(More)
OBJECTIVE Current surgical methods for treating Ménière's disease (MD), e.g. endolymphatic sac surgery, mastoidectomy or insertion of middle ear ventilation tubes, only improve vertigo and fail to influence the hearing threshold. In this retrospective study we examined the long-term effects of tenotomy on the symptoms of MD. MATERIAL AND METHODS A total(More)
The effect of possessive pronouns on the encoding of pronoun-noun associations (e.g., my garden) was investigated using the electroencephalography (EEG). Following an alphabetical, semantic and a contextual encoding instruction depth of noun processing was varied within three separate experiments in order to manipulate the grade of awareness related to(More)
With the aid of microinotophoretic techniques we tested the action of the transmitter candidate glutamate (Glu) at the afferent synapses of inner hair cells (IHC) in guinea pigs. In order to determine the various types of glutamate receptors, further agonistic excitatory amino acids (EAA) as well as competitive EAA-antagonists were used. Applied(More)
We have recently undertaken deep insertions of the Combi-40 cochlear implant electrode (Med-E1 Corp., Innsbruck, Austria) into apical regions of the scala tympani using a cochleostomy approach. In order to examine the extent of the insertional trauma, 12 fresh human temporal bones were implanted with original Combi-40 electrodes. The specimens were(More)
Human posture is a prototypical example of a complex control system. The joint output of several physiological - most likely nonlinearly interacting - processes leads to correctional movements which enable us to stand upright. These correctional body movements reflect some features of the underlying control mechanisms. We analyze the movements of quietly(More)