Word Recognition and Frequency Selectivity in Cochlear Implant Simulation: Effect of Channel Interaction.

In cochlear implants (CI), spread of neural excitation may produce channel interaction. Channel interaction disturbs the spectral resolution and, among other factors, seems to impair speech recognition, especially in noise. In this study, two tests were performed with 20 adult normal-hearing (NH) subjects under different vocoded simulations.

Influence of microphone soiling on syllable recognition in cochlear implants: simulation and recognition in noise.

Background: The microphone is the first link of the sound processing chain and if there is dirt on the membrane or in the input port, the frequency response is modified.

Objective: The effect of microphone cleaning in cochlear implants (CI) was studied by measuring speech perception scores in the noise of CI users and of normal hearing (NH) subjects with a CI simulator.

Material And Methods: Sixty-one adult CI users and 20 NH were tested.