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The use of auditory models in cochlear implant sound processing strategies aims to improve cochlear implant users? perception of speech, particularly in noisy environments. To date, cochlear implant sound processing strategies have been designed using simple envelope extraction techniques, Our new strategy, simulates the behaviour of the cochlea and the auditory nerve to give a stimulation sequence that produces responses in the auditory nerve that are closer to those in normal hearing. The development and evaluation of the strategy may also help to answer the fundamental question of how much benefit is provided by fine-grained timing information to the perception of different sounds that make up speech.

A physiological and computational model of the human auditory system has been fitted in a signal processing strategy for cochlear implants (CIs). The aim of the new strategy is to obtain more natural sound in CIs by better mimicking the human auditory system. The new strategy was built in three independent stages as proposed in [6]. First a basilar membrane motion model was substituted by the filterbank commonly used in commercial strategies. Second, an inner hair cell model was included in a commercial strategy while maintaining the original filterbank. Third, both the basilar membrane motion and the inner-hair cell model were included in the commercial strategy. This paper analyses the properties and presents results obtained with CI recipients for each algorithm designed.

Neural coding of the pitch of complex sounds is vital for animals? ability to communicate and to perceptually organize natural acoustic scenes. Harmonic complex sounds typically have a well defined pitch corresponding to their fundamental frequency, whereas inharmonic sounds can exhibit pitch ambiguity: their pitch can have more than one value. Iterated rippled noise (IRN), a common "pitch stimulus," is generated from broadband noise by a cascade of delay-and-add steps, with the delayed noise phase-shifted by varphi degrees. By varying varphi, the (in)harmonicity, and therefore the pitch ambiguity, of IRN can be manipulated. Recordings were made from single-units in the ventral cochlear nucleus of anesthetized guinea pigs in response to IRN and complex tones, systematically varying the inharmonicity. In their all-order interspike interval distributions, primary-like and chopper units tuned within the phase-locking range of best frequencies represent the waveform temporal fine structure (which varies with varphi). In contrast, those units tuned to higher frequencies represent the temporal-envelope modulation (independent of varphi). We show a temporal representation of ambiguous pitch for IRN and complex tones based on responses to the stimulus fine structure. Within the dominance region for pitch this representation follows the predictions of classic human behavioral experiments and provides a unifying contribution to possible neuro-temporal explanations for the pitch shift and pitch ambiguity associated with many inharmonic sounds. 10.1523/JNEUROSCI.3137-08.2008