Ruth Litovsky University of Wisconsin Madison, WI USA
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1 WAISMAN CENTER Binaural Hearing and Speech Laboratory Emergence of Spa?al Hearing in Pediatric Bilateral Cochlear Implant Users Ruth Litovsky University of Wisconsin Madison, WI USA ACIA, Nashville, December 2014 h5p://
2 In Children: Growing trend: Implant in both ears (bilateral) In normal- hearing children: of inputs from two ears In the auditory brainstem In children fi5ed with Bilateral CIs: No of inputs from the two ears
3 Cochlear Implants Complex waveforms can be decomposed into a slowly varying envelope (ENV) modula@ng a rapidly- varying temporal fine- structure (TFS).
4 Growing trend: Implant in both ears (bilateral) Goal: provide CI users the ability to localize sounds and to understand speech in noise at better SNR
5 Results to date Normal Hearing > Bilateral CIs > Unilateral CI Children with Bilateral CIs perform be#er with than children with a single CIs. However, they are significantly worse than normal- hearing peers: Sound localiza@on Speech in noise (e.g., Spa@al release from masking)
6 What are the next steps? Normal Hearing > Bilateral CIs > Unilateral CI Understand the sources of limitation on performance Design processors that overcome the limitations Study performance in children in order to know which binaural cues should be preserved and presented to the children Focus on multi-electrode stimulation, in order to ensure fidelity of speech signal Let s con@nue to fill the glass
7 Ø Ø Spatial Release from Masking Improvement of speech intelligibility when the target is spatially separated or perceived to be spatially separated from the interferer(s) Reduction in masking through spatial separation Co- located VS. à à à Asymmetrically separated
8 Spatial Release from Masking (SRM) Example: SRT = 55 db SPL SRT = 45 db SPL Co- located SRM = 10 db Asymmetrically separated
9 Release from Masking Group Misurelli & Litovsky (under review); Hess & Litovsky (in prep)
10 SRM in toddlers is related to # months of hearing experience with Bilateral CIs Development or experience? Hess & Litovsky (in prep)
11 Some factors that limit performance Signal processing compromises cues Limited #channels & spectral Neural pathway Difference in the depth of electrodes between ears Difference in spread of in R & L ears
12 Match inputs across the ears? Binaural system is ideally suited for frequency- matched inputs from the right & lee ears. Left Cochlea Base Apex Right Cochlea
13 Approaches to restoring binaural inputs: Bypass the microphones / processors. Pitch-matched Loudness balanced 1 pair of electrodes Base Frequency Lee Right Apex Direct stimulation v Small number of electrodes v Precise control over stimulus reaching each electrode v Excellent binaural cues
14 In NH Children: Simulate CI processing Gaussian- enveloped tone (GET) pulse train (4 khz center frequency, 100 pulses per second). Task: 2- forced choice (with feedback): Right- Lee vs. Lee- Right tracking algorithm 1) vary ILD in db (NH) or Current units (CI) 2) vary ITD in µs Amplitude Time Ehlers et al. (in prep)
15 Subjects Just-noticeable difference (JND) threshold in children with BiCIs and NH Interaural Time Difference (ITD) 400 Interaural Time Difference Threshold (db) NH Children Children with BiCIs
16 Just-noticeable difference (JND) threshold in children with BiCIs and NH Interaural Level Difference (ILD) Interaural Level Difference Threshold (db) NH Children Children with BiCIs Interaural Level Difference Threshold (CUs) Subjects
17 Binaural cue sensitivity using research processors: Research to date shows that: à ITDs highly vulnerable to deprivation. à ILDs are highly recoverable after longterm deafness à In adults and children
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