Comparison between NRT-based MAPs and behaviourally measured MAPs at different stimulation rates – a multicentre investigation

Craddock, Louise; Cooper, Huw; Heyning, Paul Van de; Vermeire, Katrien; Davies, M K; Patel, J.K.M.; Cullington, H.E.; Ricaud, Rebecca; Brunelli, Theresa; Knight, Michelle R.; Plant, Kerrie; Dees, D. Cafarelli; Murray, Brendan

doi:10.1002/cii.78

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…Craddock et al, 2003). Thus, even though the subjects were elderly, their implant performance was comparable with other groups reported in the literature.…”

Section: Ratingsupporting

confidence: 87%

“…The fact that the C levels tended to be under-rather than overestimated is an important finding in this group who may not be able to reliably articulate discomfort from over-stimulation. The overestimation of basal C levels in ACE users reported by Craddock et al (2003) was not seen for the current group. Although the deviation between behavioral and NRT based C levels indicated that NRT thresholds slightly exceeded the measured C levels in individual subjects 2, 5, and 6, this did not result in poor comfort ratings for the NRT based MAP.…”

Section: Ratingcontrasting

confidence: 77%

“…Craddock et al, 2003) who found no significant difference in speech perception between MAPs based on psychophysical measures and those created with an NRT derived MAP with a behavioral T/C offset, as described by Brown et al (2000). The finding that MAP differences did not flow through to speech perception outcomes was also reported by Seyle and Brown (2002).…”

Section: Ratingmentioning

confidence: 60%

“…The correlation is improved when the NRT data is used in conjunction with the behavioral measures from one electrode as the relationship between the EAP and MAP T-and C-levels is reasonably constant across electrodes . The technique produces reasonably accurate prediction of behavioral measures with both SPEAK and ACE speech coding strategies in the Nucleus 24M cochlear implant (Craddock et al, 2003). While slight overestimation of basal C levels in ACE users was reported in the latter study, there was no significant difference in the performance scores of the behavioral and NRT-based MAPs.…”

Section: Sumariomentioning

confidence: 94%

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Evaluation of NRT and behavioral measures for MAPping elderly cochlear implant users

Pedley

Psarros

Gardner-Berry

et al. 2007

International Journal of Audiology

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We investigated the acceptability of electrophysiologically derived MAPs and the effect of these MAPs on speech perception in elderly adults using Nucleus 24 cochlear implants. Eight implant recipients aged 75 years or older trialed an electrophysiologically derived MAP and a behavioral MAP. The electrophysiologically derived MAP was based on the threshold and maximum comfort level for electrode 10 and evoked compound action potential thresholds measured on six electrodes using neural response telemetry (NRT). Word perception at 55 dB SPL and sentence perception in noise at 70 dB SPL were assessed after six weeks take-home experience and again after an additional two weeks of experience. During the final two weeks of take-home experience participants indicated their preferred MAP for different listening situations. The NRT derived MAP estimated behavioral T levels well, but underestimated behavioral C levels for apical electrodes in some subjects. Speech perception with NRT derived MAPs was comparable to speech perception with behaviorally measured MAPs. MAPs estimated from NRT data provided good speech perception outcomes for elderly implant recipients and were well tolerated.

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“…Craddock et al, 2003). Thus, even though the subjects were elderly, their implant performance was comparable with other groups reported in the literature.…”

Section: Ratingsupporting

confidence: 87%

Section: Ratingcontrasting

confidence: 77%

Section: Ratingmentioning

confidence: 60%

Section: Sumariomentioning

confidence: 94%

See 2 more Smart Citations

Evaluation of NRT and behavioral measures for MAPping elderly cochlear implant users

Pedley

Psarros

Gardner-Berry

et al. 2007

International Journal of Audiology

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Evaluating the Noise in Electrically Evoked Compound Action Potential Measurements in Cochlear Implants

Undurraga

Carlyon

Wouters

et al. 2012

IEEE Trans. Biomed. Eng.

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Electrically evoked compound action potentials (ECAPs) are widely used to study the excitability of the auditory nerve and stimulation properties in cochlear implant (CI) users. However, ECAP detection can be difficult and very subjective at near-threshold stimulation levels or in spread of excitation measurements. In this study, we evaluated the statistical properties of the background noise (BN) and the postaverage residual noise (RN) in ECAP measurements in order to determine an objective detection criterion. For the estimation of the BN and the RN, a method currently used in auditory brainstem response measurements was applied. The potential benefit of using weighted (Bayesian) averages was also examined. All estimations were performed with a set of approximately 360 ECAP measurements recorded from five human CI users of the CII or HiRes90K device (advanced bionics). Results demonstrated that the BN was normally distributed and the RN decreased according to the square root of the number of averages. No additional benefit was observed by using weighted averaging. The noise was not significantly different either at different stimulation intensities or across recording electrodes along the cochlea. The analysis of the statistical properties of the noise indicated that a signal-to-noise ratio of 1.7 dB as a detection criterion corresponds to a false positive detection rate of 1% with the used measurement setup.

show abstract

Comparison between NRT-based MAPs and behaviourally measured MAPs at different stimulation rates – a multicentre investigation

Cited by 2 publications

References 8 publications

Evaluation of NRT and behavioral measures for MAPping elderly cochlear implant users

Evaluation of NRT and behavioral measures for MAPping elderly cochlear implant users

Evaluating the Noise in Electrically Evoked Compound Action Potential Measurements in Cochlear Implants

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