[Electrophysiologic studies in patients with cochlear implants].

The insertion of reliable extracochlear single-canal cochlear implants in cophotic and subcophotic patients allows the electrical stimulation of the acoustic nerve for rehabilitation, as well as audiovestibular explorations that are no longer possible in the acoustic mode. The authors therefore aim at replacing all these examinations with their Electrical equivalent: --early evoked potentials (E-BERA), --medium-latency evoked potentials (E-MLR), --Event-related evoked potentials (E-P300), for which, to our knowledge, theses are the first recordings, --electrical stapedial reflex, --vestibular stimulations. The method, results and clinical and physiological applications of each method are given, as well as its prospects.

[Improvement in evoked vestibular responses by tubular vision].

Numerous factors can influence evoked or spontaneous nystagmus. In this study, the influence of reducing the visual field to a peripheral field of 18 degrees 40' was investigated in 15 subjects with normal vision. In order to reproduce the conditions of photoelectric recording with Torok's glasses, a tube was placed in front of one eye while the other eye was covered.