Modulation Enhancement in the Electrical Signal Improves Perception of Interaural Time Differences with Bimodal Stimulation

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• 作者：Tom Francart (1)
  Anneke Lenssen (1)
  Jan Wouters (1)
  
• 关键词：cochlear implant ; hearing aid ; localization ; bimodal stimulation ; electric acoustic stimulation ; interaural time difference ; MEnS ; modulation enhancement strategy
• 刊名：JARO - Journal of the Association for Research in Otolaryngology
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：15
• 期：4
• 页码：633-647
• 全文大小：722 KB
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• 作者单位：Tom Francart (1)
  Anneke Lenssen (1)
  Jan Wouters (1)
  
  1. KU Leuven, Department of Neurosciences, ExpORL, O&N2, Herestraat 49 Bus 721, 3000, Leuven, Belgium
  
• ISSN：1438-7573

文摘

Interaural timing cues are important for sound source localization and for binaural unmasking of speech that is spatially separated from interfering sounds. Users of a cochlear implant (CI) with residual hearing in the non-implanted ear (bimodal listeners) can only make very limited use of interaural timing cues with their clinical devices. Previous studies showed that bimodal listeners can be sensitive to interaural time differences (ITDs) for simple single- and three-channel stimuli. The modulation enhancement strategy (MEnS) was developed to improve the ITD perception of bimodal listeners. It enhances temporal modulations on all stimulated electrodes, synchronously with modulations in the acoustic signal presented to the non-implanted ear, based on measurement of the amplitude peaks occurring at the rate of the fundamental frequency in voiced phonemes. In the first experiment, ITD detection thresholds were measured using the method of constant stimuli for five bimodal listeners for an artificial vowel, processed with either the advanced combination encoder (ACE) strategy or with MEnS. With MEnS, detection thresholds were significantly lower, and for four subjects well within the physically relevant range. In the second experiment, the extent of lateralization was measured in three subjects with both strategies, and ITD sensitivity was determined using an adaptive procedure. All subjects could lateralize sounds based on ITD and sensitivity was significantly better with MEnS than with ACE. The current results indicate that ITD cues can be provided to bimodal listeners with modified sound processing.