David M Landsberger1, Katrien Vermeire, Annes Claes, Vincent Van Rompaey, Paul Van de Heyning. 1. 1Department of Otolaryngology, New York University School of Medicine, New York, New York, USA; 2Department of Otorhinolaryngology & Head and Neck Surgery, Antwerp University Hospital, Antwerp, Belgium; 3Hearing and Speech Center, Long Island Jewish Medical Center, New Hyde Park, New York, USA; and 4Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.
Abstract
OBJECTIVES: Although it has been shown previously that changes in temporal coding produce changes in pitch in all cochlear regions, research has suggested that temporal coding might be best encoded in relatively apical locations. The authors hypothesized that although temporal coding may provide useable information at any cochlear location, low rates of stimulation might provide better sound quality in apical regions that are more likely to encode temporal information in the normal ear. In the present study, sound qualities of single electrode pulse trains were scaled to provide insight into the combined effects of cochlear location and stimulation rate on sound quality. DESIGN: Ten long-term users of MED-EL cochlear implants with 31-mm electrode arrays (Standard or FLEX) were asked to scale the sound quality of single electrode pulse trains in terms of how "Clean," "Noisy," "High," and "Annoying" they sounded. Pulse trains were presented on most electrodes between 1 and 12 representing the entire range of the long electrode array at stimulation rates of 100, 150, 200, 400, or 1500 pulses per second. RESULTS: Although high rates of stimulation are scaled as having a Clean sound quality across the entire array, only the most apical electrodes (typically 1 through 3) were considered Clean at low rates. Low rates on electrodes 6 through 12 were not rated as Clean, whereas the low-rate quality of electrodes 4 and 5 were typically in between. Scaling of Noisy responses provided an approximately inverse pattern as Clean responses. High responses show the trade-off between rate and place of stimulation on pitch. Because High responses did not correlate with Clean responses, subjects were not rating sound quality based on pitch. CONCLUSIONS: If explicit temporal coding is to be provided in a cochlear implant, it is likely to sound better when provided apically. In addition, the finding that low rates sound clean only at apical places of stimulation is consistent with previous findings that a change in rate of stimulation corresponds to an equivalent change in perceived pitch at apical locations. Collectively, the data strongly suggest that temporal coding with a cochlear implant is optimally provided by electrodes placed well into the second cochlear turn.
OBJECTIVES: Although it has been shown previously that changes in temporal coding produce changes in pitch in all cochlear regions, research has suggested that temporal coding might be best encoded in relatively apical locations. The authors hypothesized that although temporal coding may provide useable information at any cochlear location, low rates of stimulation might provide better sound quality in apical regions that are more likely to encode temporal information in the normal ear. In the present study, sound qualities of single electrode pulse trains were scaled to provide insight into the combined effects of cochlear location and stimulation rate on sound quality. DESIGN: Ten long-term users of MED-EL cochlear implants with 31-mm electrode arrays (Standard or FLEX) were asked to scale the sound quality of single electrode pulse trains in terms of how "Clean," "Noisy," "High," and "Annoying" they sounded. Pulse trains were presented on most electrodes between 1 and 12 representing the entire range of the long electrode array at stimulation rates of 100, 150, 200, 400, or 1500 pulses per second. RESULTS: Although high rates of stimulation are scaled as having a Clean sound quality across the entire array, only the most apical electrodes (typically 1 through 3) were considered Clean at low rates. Low rates on electrodes 6 through 12 were not rated as Clean, whereas the low-rate quality of electrodes 4 and 5 were typically in between. Scaling of Noisy responses provided an approximately inverse pattern as Clean responses. High responses show the trade-off between rate and place of stimulation on pitch. Because High responses did not correlate with Clean responses, subjects were not rating sound quality based on pitch. CONCLUSIONS: If explicit temporal coding is to be provided in a cochlear implant, it is likely to sound better when provided apically. In addition, the finding that low rates sound clean only at apical places of stimulation is consistent with previous findings that a change in rate of stimulation corresponds to an equivalent change in perceived pitch at apical locations. Collectively, the data strongly suggest that temporal coding with a cochlear implant is optimally provided by electrodes placed well into the second cochlear turn.
Authors: Katrien Vermeire; David M Landsberger; Paul H Van de Heyning; Maurits Voormolen; Andrea Kleine Punte; Reinhold Schatzer; Clemens Zierhofer Journal: Hear Res Date: 2015-04-01 Impact factor: 3.208
Authors: David M Landsberger; Natalia Stupak; Emily R Spitzer; Lavin Entwisle; Laurel Mahoney; Susan B Waltzman; Sean McMenomey; David R Friedmann; Mario A Svirsky; William Shapiro; J Thomas Roland Journal: Otol Neurotol Date: 2022-03-10 Impact factor: 2.619
Authors: Kenneth K Jensen; Stefano Cosentino; Joshua G W Bernstein; Olga A Stakhovskaya; Matthew J Goupell Journal: Trends Hear Date: 2021 Jan-Dec Impact factor: 3.293
Authors: David M Landsberger; Katrien Vermeire; Natalia Stupak; Annette Lavender; Jonathan Neukam; Paul Van de Heyning; Mario A Svirsky Journal: Ear Hear Date: 2020 May/Jun Impact factor: 3.562