Wagner L et al. – This prospective controlled psychoacoustic study measured difference limen between iterated rippled noise (IRN) signals with different number of iterations in 34 cochlear implant (CI) users and 15 normal hearing subjects. Pitch matching between IRN and harmonic complex tones was measured in 7 cochlear implant users and 15 normal hearing control listeners with single–sided deafness. Following signal, the pitch onset response (POR) change from white noise to IRN was measured electrophysiologically. The CI users ability to distinguish different number of iteration in IRN signals was worse compared to normal hearing subjects. A POR was measured in both normal–hearing subjects and CI users increasing with the pitch salience of the IRN. Post CI surgery, pitch onset response can serve as an objective measure to monitor progress during audioverbal therapy.