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• W4200333885 startingPage "233121652110611" @default.
• W4200333885 abstract "The electric stimulation provided by current cochlear implants (CI) is not power efficient. One underlying problem is the poor efficiency by which information from electric pulses is transformed into auditory nerve responses. A novel stimulation paradigm using ramped pulse shapes has recently been proposed to remedy this inefficiency. The primary motivation is a better biophysical fit to spiral ganglion neurons with ramped pulses compared to the rectangular pulses used in most contemporary CIs. Here, we tested the hypotheses that ramped pulses provide more efficient stimulation compared to rectangular pulses and that a rising ramp is more efficient than a declining ramp. Rectangular, rising ramped and declining ramped pulse shapes were compared in terms of charge efficiency and discriminability, and threshold variability in seven CI listeners. The tasks included single-channel threshold detection, loudness-balancing, discrimination of pulse shapes, and threshold measurement across the electrode array. Results showed that reduced charge, but increased peak current amplitudes, was required at threshold and most comfortable levels with ramped pulses relative to rectangular pulses. Furthermore, only one subject could reliably discriminate between equally-loud ramped and rectangular pulses, suggesting variations in neural activation patterns between pulse shapes in that participant. No significant difference was found between rising and declining ramped pulses across all tests. In summary, the present findings show some benefits of charge efficiency with ramped pulses relative to rectangular pulses, that the direction of a ramped slope is of less importance, and that most participants could not perceive a difference between pulse shapes." @default.
• W4200333885 created "2021-12-31" @default.
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• W4200333885 date "2021-01-01" @default.
• W4200333885 modified "2023-10-16" @default.
• W4200333885 title "The Perception of Ramped Pulse Shapes in Cochlear Implant Users" @default.
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• W4200333885 doi "https://doi.org/10.1177/23312165211061116" @default.
• W4200333885 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34935552" @default.
• W4200333885 hasPublicationYear "2021" @default.
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