Effects of Electrical Stimulation Rate on Speech Recognition in Cochlear Implant Users
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Background and Objectives: The stimulus signals delivered in cochlear implant (CI) systems are generally derived by sampling the temporal envelope of each channel at some constant rate and using its intensity to control the stimulation current level delivered to the corresponding electrode site. The objective of the study was to investigate speech recognition performance of cochlear implant users in quiet and noisy environments using either moderate or high rates of electrical stimulations. Materials and Methods: Six post-lingually deafened adult users of the Nucleus CI24 cochlear implant (Contour® electrode array, CochlearTM, Macquarie Park, Australia) with the Freedom® speech processor participated in the study. Stimulation rates of 900 and 2400 pulses-per-second/channel (pps/ch) were used after both stimulation programs were balanced for loudness. Monosyllabic word and sentence recognition scores in quiet and noisy environments were evaluated for each stimulation program after two months of practice. Subjects were also asked to respond to a questionnaire to examine their preference to any stimulation rate in different hearing conditions. Results: Word recognition scores for monosyllabic words in quiet conditions with the 900 stimulation rate was better than that of the 2400 stimulation rate, although no significant differences between them were found for sentence test in noise. A survey questionnaire indicated that most subjects preferred the 900 stimulation rate to the 2400 stimulation rate, especially in quiet conditions. Conclusions: Most subjects indicated a preference for 900 pps/ch rate in quiet conditions. It is recommended to remap at 900 pps/ch for those CI users whose performance in quiet conditions is less than ideal
Abstract
Background and Objectives: The stimulus signals delivered in cochlear implant (CI) systems are generally derived by sampling the temporal envelope of each channel at some constant rate and using its intensity to control the stimulation current level delivered to the corresponding electrode site. The objective of the study was to investigate speech recognition performance of cochlear implant users in quiet and noisy environments using either moderate or high rates of electrical stimulations. Materials and Methods: Six post-lingually deafened adult users of the Nucleus CI24 cochlear implant (Contour® electrode array, CochlearTM, Macquarie Park, Australia) with the Freedom® speech processor participated in the study. Stimulation rates of 900 and 2400 pulses-per-second/channel (pps/ch) were used after both stimulation programs were balanced for loudness. Monosyllabic word and sentence recognition scores in quiet and noisy environments were evaluated for each stimulation program after two months of practice. Subjects were also asked to respond to a questionnaire to examine their preference to any stimulation rate in different hearing conditions. Results: Word recognition scores for monosyllabic words in quiet conditions with the 900 stimulation rate was better than that of the 2400 stimulation rate, although no significant differences between them were found for sentence test in noise. A survey questionnaire indicated that most subjects preferred the 900 stimulation rate to the 2400 stimulation rate, especially in quiet conditions. Conclusions: Most subjects indicated a preference for 900 pps/ch rate in quiet conditions. It is recommended to remap at 900 pps/ch for those CI users whose performance in quiet conditions is less than ideal
참고문헌 (11)
- Holden LK, "Effects of stimulation rate with the Nucleus 24 ACE speech coding strategy", Ear Hear, 23, pp.463~476 (2002)
- Cochlear Ltd, "Selecting stimulation rate with the Nucleus freedom system" (2007), White paper prepared by Cochlear Ltd
- Balkany T, "Nucleus Freedom North American clinical trial", Otolaryngol Head Neck Surg, 136, pp.757~762 (2007)
- Vandali AE, "Speech perception as a function of electrical stimulation rate: using the Nucleus 24 cochlear implant system", Ear Hear, 21, pp.608~624 (2000)
- Dreschler WA, "ICRA noises: artificial noise signals with speech-like spectral and temporal properties for hearing instrument assessment. International Collegium for Rehabilitative Audiology", Audiology, 40, pp.148~157 (2001)
- Arora K, "Electrical stimulation rate effects on speech perception in cochlear implants", Int J Audiol, 48, pp.561~567 (2009)
- Lee JH, "Korean Speech Audiometry" (2010), Hakjisa
- Verschuur CA, "Effect of stimulation rate on speech perception in adult users of the Med-El CIS speech processing strategy", Int J Audiol, 44, pp.58~63 (2005)
- Plant KL, "Parameter selection and programming recommendations for the ACE and CIS speech-processing strategies in the Nucleus 24 cochlear implant system", Cochlear Implants Int, 3, pp.104~125 (2002)
- Friesen LM, "Effects of stimulation rate on speech recognition with cochlear implants", Audiol Neurootol, 10, pp.169~184 (2005)
- Weber BP, "Performance and preference for ACE stimulation rates obtained with nucleus RP 8 and freedom system", Ear Hear, 28(2 Suppl), pp.46~48 (2007)