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

Craddock, L., Cooper, H., van de Heyning, P., Vermeire, K., Davies, M., Patel, J., Cullington, H.E., Ricaud, R., Brunelli, T., Knight, M., Plant, K., Cafarelli Dees, D. and Murray, B. (2003) Comparison between NRT-based MAPs and behaviourally measured MAPs at different stimulation rates – a multicentre investigation. Cochlear Implants International, 4 (4), 161-170. (doi:10.1002/cii.78).

Abstract

Seventeen adult subjects participated in a multicentre trial to compare the performance between an NRT-based MAP and their behavioural MAP. The NRT-based MAP was made using a correction factor to predict T/C levels, calculated from the difference between the ECAP threshold ('T-NRT') and the measured T/C levels at electrode 10, as described by Brown et al. (2000). A secondary aim was to compare T/C levels in behavioural MAPs at different stimulation rates with the predicted T/C levels in NRT-based MAPs. Performance with both MAPs was evaluated using CNC words and sentences. Variations in the T/C levels between all MAPs were found, although results of the speech discrimination tests demonstrated no statistically significant difference between behavioural and NRT-based MAPs.

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Contributors

Author: H.E. Cullington

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