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Place specificity of monopolar and tripolar stimuli in cochlear implants: the influence of residual masking.

Fielden, Claire A; Kluk, Karolina; McKay, Colette M

The Journal of the Acoustical Society of America. 2013;133(6):4109-23.

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Abstract

This experiment investigated whether place specificity of neural activity evoked by cochlear implant stimulation is improved in tripolar compared to monopolar mode using a forward masking protocol addressing some limitations of previous methods of measurement and analysis. The amount of residual masking (masking remaining at long masker-probe delays) was also measured, and its potential influence on the specificity measures was evaluated. The masker stimulus comprised equally loud interleaved mono- or tripolar stimulation on two electrodes equidistant from a central probe electrode in an apical and basal direction, reducing the influence of off-site listening. The effect of masker-probe distance on the threshold shift of the tripolar probe was analyzed to derive a measure of place specificity. On average, tripolar maskers were more place specific than monopolar maskers, although the mean effect was small. There was no significant effect of masker level on specificity or on the differences observed between modes. The mean influence of residual masking on normalized masking functions was similar for the two modes and, therefore, did not influence the comparison of specificity between the modes. However, variability in amount of residual masking was observed between subjects, and therefore should be considered in forward masking studies that compare place specificity across subjects.

Bibliographic metadata

Type of resource:
Content type:
Publication type:
Published date:
Abbreviated journal title:
ISSN:
Place of publication:
United States
Volume:
133
Issue:
6
Pagination:
4109-23
Digital Object Identifier:
10.1121/1.4803909
Pubmed Identifier:
23742363
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:294985
Created by:
Kluk-de Kort, Karolina
Created:
13th January, 2016, 11:52:30
Last modified by:
Kluk-de Kort, Karolina
Last modified:
13th January, 2016, 11:52:30

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