Electrically Evoked Responses in Cochlear Implant Patients

Pelizzone, M.; Kasper, A.; Montandon, P.

doi:10.3109/00206098909081628

Cited by 37 publications

(21 citation statements)

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“…This result confirms the findings by Pelizzone et al (6), Oviatt and Kileny (11) and Brix and Gedlicka (12).…”

Section: Discussionsupporting

confidence: 83%

“…Cortical processing of sounds by Cl users has been studied using electrophysiological measurements. The morphology and latencies of the endogenous cortical peaks N1 and P2 in Cl patients were found to be within the same range as those in subjects with nor mal hearing (6,11,12), Ponton et al (13) showed that the N 1 -P 2 complex yielded information about the site of cortical activation. Using spatio-temporal source modelling, sources for the N1--F2 complex to the perception of open speech.…”

Section: Introductionmentioning

confidence: 91%

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The Relation between Electric Auditory Brain Stem and Cognitive Responses and Speech Perception in Cochlear Implant Users

Groenen¹,

Makhdoum²,

Brink³

et al. 1996

Acta Oto-Laryngologica

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Groenen PÀP, Makhdouni M, van den Brink JL, Stoll man MHP, Snik AFM, vtin den Broek P, The relation between electric auditory brain stem and cognitive responses and speech perception in cochlear implant users. Acta Otolaryngol (Stockh) 1996; 116: 785-790. Electrically evoked brainstem responses (EABR) and event-related cortical potentials were recorded in seven postlingually deaf adults who were experienced users of a Nuclcus multichannel cochlear implant. The patients were divided into two subgroups: good performers and moderate performers, Poor EABR were found in two of the moderate performers. The latencies and amplitudes of the cortical N1-P2 complex in the good performers were within the same range as those of subjects with normal hearing, but were deviant in the group of moderate performers. This may indicate disturbed cochleotopical organization of the auditory cortex in the latter group. P300 measurements in the good performers showed normal latencies, whereas in the moderate performers they were prolonged. The results suggest that the outcomes of electrophysiological measurements to assess the integrity of a patient's auditory neural system on a brainstem and. a cortical level, are related to the patient's performance with the cochlear implant.

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“…This result confirms the findings by Pelizzone et al (6), Oviatt and Kileny (11) and Brix and Gedlicka (12).…”

Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 91%

The Relation between Electric Auditory Brain Stem and Cognitive Responses and Speech Perception in Cochlear Implant Users

Groenen¹,

Makhdoum²,

Brink³

et al. 1996

Acta Oto-Laryngologica

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“…4). This is in agreement with previous animal and human data [van den Honert and Stypulkowski, 1986;Pelizzone et al, 1989], suggesting that the aCNPs and eCNPs were produced by similar underlying events in the auditory periphery and brainstem nuclei. However, as previously established by others [Prijs and Eggermont, 1975], acoustic and electric responses differ not only by their latencies, but also by their detailed waveform pattern, especially when comparing N 1 and N 2 magnitudes ( fig.…”

Section: Comparison Of Acoustic and Electric Compound Action Potentialssupporting

confidence: 82%

Matching the Neural Adaptation in the Rat Ventral Cochlear Nucleus Produced by Artificial (Electric) and Acoustic Stimulation of the Cochlea

et al. 2004

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To investigate neural adaptive properties, near-field evoked potentials were recorded from a chronically implanted electrode in the ventral cochlear nucleus in awake Long-Evans rats exposed to acoustic stimuli or receiving intracochlear electric stimulation. Stimuli were 250-ms trains of repetitive acoustic clicks (10, 30 and 50 dB SPL) or biphasic electric pulses (30, 50 and 70 µA) with intratrain pulse rates ranging from 100 to 1000 pulses per second (pps). The amplitude of the first negative (N₁) to positive (P₁) component of the average evoked potentials was measured for each consecutive individual pulse in the train. While a progressive exponential decrease in N₁–P₁ amplitude was observed as a function of the position of the pulse within the train for both types of stimulation, the decrement of electric responses (adaptive pattern) was substantially less prominent than that observed for acoustic stimuli. Based on this difference, the present work was extended by modifying electric stimuli in order to try to restore normal adaptation phenomena. The results suggest the feasibility of mimicking acoustic adaptation by stimulation with exponentially decreasing electric pulse trains, which may be clinically applicable in the auditory implant field.

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“…In general, wave eI was not observed due to the stimulation pulse artifact from the implant. The amplitude of wave eV was larger than an acoustically evoked ABR amplitude, and latency which occurs approximately 3.6 ms after the onset of the stimulus is shorter because the electrical stimulus directly activates the neural pathway (Starr and Brackmann 1979;Pelizzone et al 1989). Figure 1b shows the results of the BIC across 12 electrode pairs (R1-R12), for S5 with reference electrode of L4.…”

Section: Resultsmentioning

confidence: 99%