Using evoked compound action potentials to assess activation of electrodes and predict C-levels in the Tempo+ cochlear implant speech processor.

Objective: In this study, we analyze how electrically evoked compound action potential (ECAP) responses can be used to assess whether electrodes should be activated in the map and to estimate C levels in the Med-El Tempo+ Cochlear Implant Speech Processor.

Design: ECAP thresholds were measured using the ECAP Recording System of the Pulsar CI implant. Twenty-one postlingually and 28 prelingually deafened patients participated in this study.

An improved masker-probe method for stimulus artifact reduction in electrically evoked compound action potentials.

The masker-probe paradigm is a commonly used technique to reduce stimulus artifact in electrically evoked compound action potential registers. This method takes advantage of the refractory properties of the cochlear nerve, combining the responses to different types of stimulation pulses in order to obtain the biological response free of artifact. In this paper we extend the masker-probe paradigm by combining the responses to these stimulation pulses with optimal weights.

Generalized alternating stimulation: a novel method to reduce stimulus artifact in electrically evoked compound action potentials.

Stimulus artifact is one of the main limitations when considering electrically evoked compound action potential for clinical applications. Alternating stimulation (average of recordings obtained with anodic-cathodic and cathodic-anodic bipolar stimulation pulses) is an effective method to reduce stimulus artifact when evoked potentials are recorded. In this paper we extend the concept of alternating stimulation by combining anodic-cathodic and cathodic-anodic recordings with a weight in general different to 0.