Effects of auditory pathway anatomy and deafness characteristics? Part 2: On electrically evoked late auditory responses

Guiraud, Jeanne; Gallégo, Stéphane; Arnold, Laure; Boyle, Patrick; Truy, Éric; Collet, Lionel

doi:10.1016/j.heares.2007.01.022

Cited by 11 publications

(12 citation statements)

References 112 publications

(143 reference statements)

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“…In CI users, the LAEP has been recorded using electric stimuli presented through the CI electrode or acoustic stimuli presented in the sound fi eld (Brix & Gedlicka, 1991;Ponton et al, 1996;Eggermont et al, 1997;Sharma et al, 2000;Hoppe et al, 2001;Firszt et al, 2002;Kelly et al, 2005;Guiraud et al, 2007;Kileny, 2007). The LAEP in CI users with good speech perception has similar morphologies compared to that in normal hearing (NH) listeners.…”

Section: Sumariomentioning

confidence: 99%

“…The intensity of the stimuli was set at 80 dB SPL, but participants were allowed to change the implant settings to insure that stimuli were presented at a loudness level of approximately 7 on a 0-10 point numerical scale (inaudible to too loud). Thus, each participant listened to the stimuli at the most comfortable listening level (Hoppe et al, 2001;Guiraud et al, 2007). This approach has been used in previous studies (Kelly et al, 2005).…”

Section: Stimulimentioning

confidence: 99%

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The adaptive pattern of the late auditory evoked potential elicited by repeated stimuli in cochlear implant users

Zhang

Anderson

Samy

et al. 2010

International Journal of Audiology

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To describe the adaptive pattern of cortically generated auditory evoked potentials elicited by repeated stimuli via cochlear implants (CIs), the late auditory evoked potential (LAEP) was collected from nine postlingually deafened adult CI users. Tone bursts were presented in 30 trains consisting of 10 tone bursts each, with inter-stimulus intervals (ISIs) of 0.7 ms and inter-train intervals (ITIs) of 15s. The response to the first stimulus and the response to later tone bursts in the train were compared. Results showed that the LAEP for the first tone burst was larger than that for later tone bursts, displaying an adaptive pattern. This pattern appeared to be more prominent in CI users with good speech perception performance than in those with poorer performance. This finding is meaningful in the context of our future research to restore normal adaptation in CI users to improve their speech perception performance.

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Section: Sumariomentioning

confidence: 99%

Section: Stimulimentioning

confidence: 99%

The adaptive pattern of the late auditory evoked potential elicited by repeated stimuli in cochlear implant users

Zhang

Anderson

Samy

et al. 2010

International Journal of Audiology

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“…This latency was measured for each subset of recording electrodes. Such a wide time window was explored because of the high variability of N1 latency in cochlear implantees, something that appears to depend on the duration of deafness (Guiraud et al, 2007), the duration of implant use (Gordon et al, 2004), and the intensity of stimulation (Firszt et al, 2002). The N1 amplitude for each subset of electrodes was then measured as the average amplitude over a 30 ms time window around the corresponding peak latency.…”

Section: Methodsmentioning

confidence: 99%

Evidence of a Tonotopic Organization of the Auditory Cortex in Cochlear Implant Users

Guiraud

Besle²,

Arnold³

et al. 2007

J. Neurosci.

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Deprivation from normal sensory input has been shown to alter tonotopic organization of the human auditory cortex. In this context, cochlear implant subjects provide an interesting model in that profound deafness is made partially reversible by the cochlear implant. In restoring afferent activity, cochlear implantation may also reverse some of the central changes related to deafness. The purpose of the present study was to address whether the auditory cortex of cochlear implant subjects is tonotopically organized. The subjects were thirteen adults with at least 3 months of cochlear implant experience. Auditory event-related potentials were recorded in response to electrical stimulation delivered at different intracochlear electrodes. Topographic analysis of the auditory N1 component (ϳ85 ms latency) showed that the locations on the scalp and the relative amplitudes of the positive/negative extrema differ according to the stimulated electrode, suggesting that distinct sets of neural sources are activated. Dipole modeling confirmed electrode-dependent orientations of these sources in temporal areas, which can be explained by nearby, but distinct sites of activation in the auditory cortex. Although the cortical organization in cochlear implant users is similar to the tonotopy found in normal-hearing subjects, some differences exist. Nevertheless, a correlation was found between the N1 peak amplitude indexing cortical tonotopy and the values given by the subjects for a pitch scaling task. Hence, the pattern of N1 variation likely reflects how frequencies are coded in the brain.

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“…Комплекс P 1 -N 1 -P 2 у взрослого регистрируется как на акустическую, так и на электрическую стимуляцию в окне 50-250 мс [3][4][5]8], хотя при прямой электрической стимуляции латентные периоды (ЛП) могут быть короче [8][9][10]. У взрослых пациентов с кохлеарными имплантами (КИ) пики P 1 , N 1 и P 2 имеют ЛП 40-80, 75-150 и 150-210 мс соответственно [8,10,11].…”

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The electrically evoked potentials of the auditory cortex

Таварткиладзе¹

2018

Vestn. otorinolaringol.

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The problems concerning the registration of late latency auditory responses to electric stimulation in the patients wearing cochlear implants are considered. The renewed interest to this class of evoked potentials is due to unexplained differences in the results of cochlear implantation in the patients with the similar audiological data, etiology, age and the history of deafness as well as cochlear implant surgery in children of first years of life and the extended possibilities for speech processor programming. It is maintained that the advantages of this method include the possibility to objectively evaluate the ability of brain to detect and discriminate between different stimulus characteristics, such as loudness differences, temporal changes or speech tokens. This method is of great clinical significance for the electrophysiological monitoring of brain plasticity and documentation of the clinical effectiveness of different rehabilitation methods. Based on our own experimental and clinical results and the literature data, we consider the application of different electrically evoked late latency potentials for the monitoring of the auditory pathway maturation dynamics during the electric stimulation as well for the estimation of the effectiveness of cochlear implantation. It is concluded that the longer duration of deafness and later age at implantation result in immature morphology and delayed peak latencies and that patients with shorter latencies and higher amplitudes have better speech perception. The use of different classes of electrically evoked responses of auditory cortex could provide the objective control of the effectiveness of the rehabilitative measured in the children following cochlear implantation.

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Effects of auditory pathway anatomy and deafness characteristics? Part 2: On electrically evoked late auditory responses

Cited by 11 publications

References 112 publications

The adaptive pattern of the late auditory evoked potential elicited by repeated stimuli in cochlear implant users

The adaptive pattern of the late auditory evoked potential elicited by repeated stimuli in cochlear implant users

Evidence of a Tonotopic Organization of the Auditory Cortex in Cochlear Implant Users

The electrically evoked potentials of the auditory cortex

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