Effect of pulse phase duration on forward masking and spread of excitation in cochlear implant listeners.

PloS One
Ning ZhouJohn J Galvin

Abstract

Previous cochlear implant (CI) research has shown that at a pulse train with a long pulse phase duration (PPD) requires less current but greater charge to obtain the same loudness as a pulse train with a short PPD. This might result in different excitation patterns between long and short PPDs. At equal loudness, long PPDs might produce greater masking due to greater charge. However, because they require less current, long PPDs may produce a smaller spatial spread of excitation (SOE) compared to short PPDs by evoking a greater neural firing probability within the relatively small current field. To investigate the effects of PPD on excitation patterns, overall masking and SOE were compared for equally loud stimuli with short or long PPD in 10 adult CI ears. Forward masking patterns were measured at relatively soft, medium, and loud presentation levels. Threshold shifts were calculated in terms of percent dynamic range (DR) of the probe. The area under the curve (AUC) of the masking functions was significantly larger for the long PPD than for the short PPD masker. The difference in AUC was proportional to the difference in charge between the short and long PPD maskers. To estimate SOE, the masking patterns were first normalized to...Continue Reading

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Jun 12, 2020·Journal of Neuroscience Methods·Ning ZhouJohn J Galvin

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Citations

Feb 10, 2021·Journal of the Association for Research in Otolaryngology : JARO·Ning ZhouJohn Galvin

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Methods Mentioned

BETA
cochlear implant

Software Mentioned

NIC
MATLAB

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