Place-pitch manipulations with cochlear implants

Olivier Macherey 1 Robert P Carlyon 2
1 Sons
MRC CBU - Cognition and Brain Sciences Unit, LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
Abstract : Pitch can be conveyed to cochlear implant listeners via both place of excitation and temporal cues. The transmission of place cues may be hampered by several factors, including limitations on the insertion depth and number of implanted electrodes, and the broad current spread produced by monopolar stimulation. The following series of experiments investigate several methods to partially overcome these limitations. Experiment 1 compares two recently published techniques that aim to activate more apical fibers than produced by monopolar or bipolar stimulation of the most apical contacts. The first technique (phantom stimulation) manipulates the current spread by simultaneously stimulating two electrodes with opposite-polarity pulses of different amplitudes. The second technique manipulates the neural spread of excitation by using asymmetric pulses and exploiting the polarity-sensitive properties of auditory nerve fibers. The two techniques yielded similar results and were shown to produce lower place-pitch percepts than stimulation of monopolar and bipolar symmetric pulses. Furthermore, combining these two techniques may be advantageous in a clinical setting. Experiment 2 proposes a method to create place pitches intermediate to those produced by physical electrodes by using charge-balanced asymmetric pulses in bipolar mode with different degrees of asymmetry.
Type de document :
Article dans une revue
Journal of the Acoustical Society of America, Acoustical Society of America, 2012, 131 (3), pp.2225-36. <10.1121/1.3677260>
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Contributeur : Olivier Macherey <>
Soumis le : vendredi 15 novembre 2013 - 16:58:19
Dernière modification le : mardi 10 mai 2016 - 11:06:06



Olivier Macherey, Robert P Carlyon. Place-pitch manipulations with cochlear implants. Journal of the Acoustical Society of America, Acoustical Society of America, 2012, 131 (3), pp.2225-36. <10.1121/1.3677260>. <hal-00905042>



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