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Perceptual adaptation by normally hearing listeners to a simulated "hole" in hearing

Smith, MW; Faulkner, A; (2006) Perceptual adaptation by normally hearing listeners to a simulated "hole" in hearing. J ACOUST SOC AM , 120 (6) 4019 - 4030. 10.1121/1.2359235. Green open access

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Abstract

Simulations of cochlear implants have demonstrated that the deleterious effects of a frequency misalignment between analysis bands and characteristic frequencies at basally shifted simulated electrode locations are significantly reduced with training. However, a distortion of frequency-to-place mapping may also arise due to a region of dysfunctional neurons that creates a "hole" in the tonotopic representation. This study simulated a 10 mm hole in the mid-frequency region. Noise-band processors were created with six output bands (three apical and three basal to the hole). The spectral information that would have been represented in the hole was either dropped or reassigned to bands on either side. Such reassignment preserves information but warps the place code, which may in itself impair performance. Normally hearing subjects received three hours of training in two reassignment conditions. Speech recognition improved considerably with training. Scores were much lower in a baseline (untrained) condition where information from the hole region was dropped. A second group of subjects trained in this dropped condition did show some improvement; however, scores after training were significantly lower than in the reassignment conditions. These results are consistent with the view that speech processors should present the most informative frequency range irrespective of frequency misalignment. 0 2006 Acoustical Society of America.

Type:Article
Title:Perceptual adaptation by normally hearing listeners to a simulated "hole" in hearing
Open access status:An open access version is available from UCL Discovery
DOI:10.1121/1.2359235
Keywords:COCHLEAR-IMPLANT, SPEECH-PERCEPTION, DEAD REGIONS, IMPAIRED LISTENERS, HIGH-FREQUENCIES, INSERTION DEPTH, OPPOSITE EAR, RECOGNITION, INFORMATION, INTELLIGIBILITY
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Psychology and Language Sciences (Division of) > Speech, Hearing and Phonetic Sciences
UCL > School of Life and Medical Sciences > Faculty of Life Sciences

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