FEATURES OF STIMULATION IMPORTANT FOR ELECTRICAL HEARING
Principal Investigator: BRYAN PFINGST
Abstract: DESCRIPTION: (as per applicant abstract) One of the most exciting advances in auditory prosthesis research in the last five years is the demonstration by our laboratory and others that speech recognition with cochlear implants can be significantly affected by the configuration of the electrical stimuli delivered to individual channels of the implant. The objectives of this proposal are to define the functional effects of specific spatial configurations of the electrical stimulus using speech recognition and psychophysical measures. We will expand on previous studies to define the processing strategies and types of stimuli for which various configurations of the electrical signal are most effective. Human subjects with Nucleus 22, Nucleus 24M and Clarion prostheses will be used. Psychophysical measures will include difference limens for pulse-rate, modulation-frequency, electrode-place, and intensity. Stimuli for speech-recognition testing will include phonemes, words, and complete sentences tested in quiet and in noise. The studies will be guided by models of the spatial extent and pattern of central neural excitation generated by specific electrical- current configurations. Psychophysical threshold, loudness, and gap detection data that have been proposed to reflect spread of neural activation will be obtained for the various configurations. This series of studies is expected to lead to improved performance in patients with cochlear implants by (a) influencing the procedures for fitting today's processors to individual patients and (b) guiding the design of electrode arrays and processors for the implants of the future.
Funding Period: 1999-05-01 - 2006-04-30
more information: NIH RePORT
- Current-level discrimination using bipolar and monopolar electrode configurations in cochlear implantsWard R Drennan
Department of Otolaryngology, Kresge Hearing Research Institute, University of Michigan, Ann Arbor, 48109 0506, USA
Hear Res 202:170-9. 2005....
- Relative contributions of spectral and temporal cues for phoneme recognitionLi Xu
School of Hearing, Speech and Language Sciences, Ohio University, Athens, Ohio 45701, USA
J Acoust Soc Am 117:3255-67. 2005..Information transfer analyses showed different relative contributions of spectral and temporal cues in the perception of various phonetic/acoustic features...
- Psychophysical metrics and speech recognition in cochlear implant usersBryan E Pfingst
Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan Health System, Ann Arbor, MI 48109 0506, USA
Audiol Neurootol 10:331-41. 2005..Thus, these psychophysical metrics are effective for diagnosis of individual differences in performance of subjects with cochlear implants. Furthermore, they point to some potentially useful treatment procedures...
- Efficacy of a cochlear implant simultaneous analog stimulation strategy coupled with a monopolar electrode configurationLi Xu
Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan, Ann Arbor, Michigan, USA
Ann Otol Rhinol Laryngol 114:886-93. 2005..The present study was performed to evaluate the efficacy and clinical feasibility of using monopolar stimulation with the Clarion Simultaneous Analog Stimulation (SAS) strategy in patients with cochlear implants...
- Current-level discrimination in the context of interleaved, multichannel stimulation in cochlear implants: effects of number of stimulated electrodes, pulse rate, and electrode separationWard R Drennan
Kresge Hearing Research Institute, University of Michigan, Ann Arbor, MI 48109 0506, USA
J Assoc Res Otolaryngol 7:308-16. 2006..This might have been the result of adaptation to the clinical pulse rate, or listeners might have chosen their inherently best pulse rate during the clinical fitting...
- Effects of carrier pulse rate and stimulation site on modulation detection by subjects with cochlear implantsBryan E Pfingst
Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan, Ann Arbor 48109 0506, USA
J Acoust Soc Am 121:2236-46. 2007..The data suggest a distinct disadvantage to using carrier pulse rates as high as 4000 pps. Stimulation site should be considered in evaluating modulation detection ability...
- Psychophysical assessment of stimulation sites in auditory prosthesis electrode arraysBryan E Pfingst
Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan Health System, Ann Arbor, MI 48109 5506, USA
Hear Res 242:172-83. 2008..Another approach is to revise stimulation parameters for ineffective sites in an effort to improve acuity at those sites. In this paper, we discuss data supporting these approaches and some potential pitfalls...
- Spectral and temporal cues for speech recognition: implications for auditory prosthesesLi Xu
School of Hearing, Speech and Language Sciences, Ohio University, Athens, OH 45701, USA
Hear Res 242:132-40. 2008..Most current auditory prostheses seem to deliver adequate temporal-envelope information, but the number of effective channels is suboptimal, particularly for speech recognition in noise, lexical tone recognition, and music perception...