Influence of stimulus frequency on NRT recordings

International Journal of Audiology
Basile CharasseLionel Collet

Abstract

Research in neural response telemetry (NRT) with the Cochlear 'Nucleus' CI24M Implant began a few years ago, using the first NRT software version (2.04). It has been demonstrated that NRT offers possibilities for fitting the implant speech processor. NRT sessions, however, remain lengthy for the patients, especially for children, and NRT research is seeking to reduce session time. The new version of the NRT software (3.0) allows implant stimulation up to 400 Hz, whereas the previous version stimulated only up to 80 Hz. The time gained is very significant. The goal of the present study was to observe and assess the modifications in NRT produced by these higher stimulus frequencies. Growth functions were measured in six adult patients for electrodes 5-10-15-20 at frequencies of 20, 80, 150, 250 and 365 Hz to determine NRT thresholds (NRT-T). Subjective detection thresholds (T) were also measured for the same electrodes and frequencies. The results showed that the number of valid responses, like the quality and amplitude of the NRT response, quickly decreased at these higher rates. Consequently, the number of measurement points used for the growth function decreased with frequency. Moreover, when frequency increased, the T value d...Continue Reading

References

Jan 1, 1982·Audiology : Official Organ of the International Society of Audiology·U Eysholdt, C Schreiner
Jul 1, 1994·Audiology : Official Organ of the International Society of Audiology·G Lina-GranadeA Morgon
Jan 26, 2002·American Journal of Audiology·R F Burkard, D Sims

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Citations

Aug 11, 2004·Artificial Intelligence in Medicine·Basile CharasseLionel Collet
Dec 9, 2017·Ear and Hearing·Jan Dirk BiesheuvelJohan H M Frijns
Jan 15, 2019·International Journal of Audiology·Andrzej MoliszErwin F Offeciers
Jul 1, 2021·International Journal of Audiology·Patricia EstienneSantiago L Arauz

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