title: Effects of insertion depth on spatial speech perception in noise for simulations of cochlear implants and single-sided deafness.
abstract: This study evaluated the effects of insertion depth on spatial speech perception in noise for simulations of cochlear implants (CI) and single-sided deafness (SSD).
  
  
  
  Mandarin speech recognition thresholds were adaptively measured in five listening conditions and four spatial configurations. The original signal was delivered to the left ear. The right ear received either no input, one of three CI simulations in which the insertion depth was varied, or the original signal. Speech and noise were presented at either front, left, or right.
  
  
  
  Ten Mandarin-speaking NH listeners with pure-tone thresholds less than 20 dB HL.
  
  
  
  Relative to no input in the right ear, the CI simulations provided significant improvements in head shadow benefit for all insertion depths, as well as better spatial release of masking (SRM) for the deepest simulated insertion. There were no significant improvements in summation or squelch for any of the CI simulations.
  
  
  
  The benefits of cochlear implantation were largely limited to head shadow, with some benefit for SRM. The greatest benefits were observed for the deepest simulated CI insertion, suggesting that reducing mismatch between acoustic and electric hearing may increase the benefit of cochlear implantation.
authors.affiliation: a Department of Otolaryngology , Southwest Hospital, Third Military Medical University , Gao Tan Yan Street, Shaping Ba District , Chongqing , 400038 , China and.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zhou
authors.affiliation: a Department of Otolaryngology , Southwest Hospital, Third Military Medical University , Gao Tan Yan Street, Shaping Ba District , Chongqing , 400038 , China and.
authors.forename: Huajun
authors.initials: H
authors.lastname: Li
authors.affiliation: b Department of Head and Neck Surgery , David Geffen School of Medicine, University of California Los Angeles , Los Angeles , CA 90095 , USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: Galvin
authors.affiliation: b Department of Head and Neck Surgery , David Geffen School of Medicine, University of California Los Angeles , Los Angeles , CA 90095 , USA.
authors.forename: Qian-Jie
authors.initials: QJ
authors.lastname: Fu
authors.affiliation: a Department of Otolaryngology , Southwest Hospital, Third Military Medical University , Gao Tan Yan Street, Shaping Ba District , Chongqing , 400038 , China and.
authors.forename: Wei
authors.initials: W
authors.lastname: Yuan
mesh_terms: D000161:Acoustic Stimulation; D001301:Audiometry, Pure-Tone; D001302:Audiometry, Speech; D001309:Auditory Threshold; D019929:Cochlear Implantation / Q000295:instrumentation*; D003054:Cochlear Implants; D003638:Deafness / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology / Q000534:rehabilitation*; D004558:Electric Stimulation; D006309:Hearing; D006801:Humans; D009622:Noise / Q000009:adverse effects*; D010470:Perceptual Masking; D019986:Persons with Hearing Disabilities / Q000523:psychology / Q000534:rehabilitation*; D021641:Recognition, Psychology; D013017:Sound Localization; D013067:Speech Perception
keywords: Cochlear implants; insertion depth; single-side deafness; spatial release from masking