Music perception in bimodal cochlear implant users

摘要: While most cochlear implant users can perceive speech signals in quiet conditions very well, the perception of music is reported to be poor for them. In this thesis was main focus research. It has been found that cannot pitches melodies which are important perception. Another limitation their recognition musical instruments or more generally timbre sounds. widely believed current technology implants suitable only coding and not signals. There a need investigate reasons such music. The pitch reason A literature review showed although satisfactory users, there also possibility interference between other aspects like intensity quality Therefore rest research, effects these two on were investigated. Three mechanisms identified by could influence (Current spreading, Electrode activation Spectral spreading). Each mechanism tested inputting specific stimulus type sound processor at different levels. Twelve bimodal participants part perceived quantified through selected matched frequency value non-implanted ear (bimodal matching). results effect observed when spreading happened. finding research due stimulating electrodes lower than Greenwood’s prediction. addition, spectral present complex notes, low significantly from high  0BMusic frequency. wide range created narrow implant. large individual differences among people. Some higher while others intensity. To test all above twice: once with pure tone as matching again ear. frequencies using tones counterparts tones. This had significant pitch. addition done one (monaural matching) types both sounds completely similar, match precision. another indication an Monaural implanted greater comparison monaural An earlier study conducted author star performer indicated CIs provide enough information single instrument listener familiar instrument. Bimodal may experience percepts ears. implication larger number narrower analysis filters better fine structure improve suggest restricted well.