Results from 12 children who use hearing aids with cochlear implants (aged 6 to 16 years) indicate that hearing aid gain-frequency response can be prescribed in the same way as for people who wear hearing aids in both ears. Optimisation of hearing aids with cochlear implants can facilitate integration of information from both ears. All children benefited from using bilateral amplification compared to using cochlear implants only. On average, improvements in speech perception, functional performance in everyday life, and localisation were demonstrated. There is considerable variability in the amount of benefit obtained between individuals.

This project is now extended in four ways. Firstly, to assess validity of benefits from bilateral amplification by conducting multi-site trials. Secondly, to optimise hearing aid fittings and to measure benefits from bilateral amplification for children younger than six years. Thirdly, to examine the potential benefits of refitting hearing aids to children who have not worn hearing aids in the non-implanted ear since implantation. Fourthly, to evaluate benefits of bilateral amplification in adults.

1. That people who have continued to wear hearing aids in the opposite ear since implantation do benefit from hearing aid amplification in that ear
2. That people who have not continued to wear hearing aids in the opposite ear since implantation will benefit from the reintroduction of hearing aid amplification in that ear.
3. That hearing aids for people with cochlear implants in the opposite ear should be prescribed in the same way as for people who wear hearing aids in both ears.