Effects of Stimulus Duration on Event-Related Potentials Recorded From Cochlear-Implant Users
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Date
2017-05
Journal Title
Journal ISSN
Volume Title
Publisher
Wolters Kluwer Health
Abstract
OBJECTIVES: Several studies have investigated the feasibility of using electrophysiology as an objective tool to efficiently map cochlear implants. A pervasive problem when measuring event-related potentials is the need to remove the direct-current (DC) artifact produced by the cochlear implant. Here, we describe how DC artifact removal can corrupt the response waveform and how the appropriate choice of stimulus duration may minimize this corruption. DESIGN: Event-related potentials were recorded to a synthesized vowel /a/ with a 170- or 400-ms duration. RESULTS: The P2 response, which occurs between 150 and 250 ms, was corrupted by the DC artifact removal algorithm for a 170-ms stimulus duration but was relatively uncorrupted for a 400-ms stimulus duration. CONCLUSIONS: To avoid response waveform corruption from DC artifact removal, one should choose a stimulus duration such that the offset of the stimulus does not temporally coincide with the specific peak of interest. While our data have been analyzed with only one specific algorithm, we argue that the length of the stimulus may be a critical factor for any DC artifact removal algorithm.
Description
Keywords
Cochlear implant, EEG, Artifact removal
Citation
Presacco, A., H. Innes-Brown, M. J. Goupell, and S. Anderson. 2017. Effects of Stimulus Duration on Event-Related Potentials Recorded From Cochlear-Implant Users. Ear and Hearing. 38(6): e389-e393.