Alex Kasper

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Binaural interaction was demonstrated in electrically evoked brainstem responses (EBRs) of a bilaterally implanted patient. A clear binaural difference waveform (BD), consisting of a negative peak near 3.6 ms followed by a positive peak near 4.4 ms, was found by subtracting the recordings with diotic stimulation from the sum of the recordings with monotic(More)
Two identical multichannel intracochlear prostheses were implanted in the same patient. The first prosthesis, implanted in the congenitally-deaf right ear, elicited clear sound perception but no speech recognition. After 2 years, a second prosthesis, implanted in the acquired-deaf left ear, enabled the patient to understand speech without lip-reading.(More)
The present study examined a visual field asymmetry in the contingent capture of attention that was previously observed by Du and Abrams (2010). In our first experiment, color singleton distractors that matched the color of a to-be-detected target produced a stronger capture of attention when they appeared in the left visual hemifield than in the right(More)
Intracochlear potential distributions were measured from subjects implanted with the Ineraid multichannel cochlear implant. The electrode array provided direct accessibility for obtaining measurements. Different modes of stimulation were used. The findings with intracochlear monopolar stimulation seem to confirm that significant low-resistance pathways, in(More)
In Geneva from 1985 to November 1990, we have implanted 21 Ineraid TM multichannel-cochlear implants in 18 totally deaf patients. On the basis of our experience we have divided the patients in 2 categories: optimal cases and difficult cases. Optimal cases had post lingual deafness and adequate anatomical conditions for implantation. They all recovered(More)
In order to better understand the reasons for success or failure of a cochlear implant system for various patients, it appears necessary to analyze the patients' basic psychophysical capacities in relation to speech perception. Five patients with intracochlear multichannel Ineraid implants were studied in terms of their performance on temporal analysis in(More)
A series of tests was recently undertaken on three multi-channel cochlear implant patients showing different degrees of open speech understanding in order to try to determine underlying differences in inner ear excitation. First we wanted to determine whether these patients showed notable differences in basic psychophysical tasks. This article reports a(More)
Highly reproducible recordings of evoked responses elicited by electrical stimulation of the auditory nerve were obtained in a group of 4 totally deaf patients implanted with a multichannel intracochlear prosthesis. They were compared to auditory evoked responses obtained in a normal-hearing subject tested with the same equipment. The most striking(More)
Electrically evoked short latency vestibular potentials were recorded in 9 patients during vestibular neurectomy. Patients were operated on because of intractable Meniere's disease. The VIIIth cranial nerve was exposed through a limited retrosigmoidal approach; the vestibular nerve was contacted in the cerebello-pontine angle with a bipolar platinum-iridium(More)
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