TY - JOUR
T1 - Factors constraining the benefit to speech understanding of combining information from low-frequency hearing and a cochlear implant
AU - Dorman, Michael
AU - Cook, Sarah
AU - Spahr, Anthony
AU - Zhang, Ting
AU - Loiselle, Louise
AU - Schramm, David
AU - Whittingham, JoAnne
AU - Gifford, Rene
N1 - Funding Information:
This research was supported by grants from the NIDCD to authors M. Dorman and R.Gifford ( R01 DC 010821 ), T.Spahr ( R03 DC 011052 ) and T.Zang ( F32 DC010937 ). Arran McAfee and JoAnne Whittingham were responsible for the collection and organization of the data from the University of Ottawa. Leo Litvak of Advanced Bionics computed the 95% critical difference scores for the AzBio sentences used in this paper.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - Many studies have documented the benefits to speech understanding when cochlear implant (CI) patients can access low-frequency acoustic information from the ear opposite the implant. In this study we assessed the role of three factors in determining the magnitude of bimodal benefit - (i) the level of CI-only performance, (ii) the magnitude of the hearing loss in the ear with low-frequency acoustic hearing and (iii) the type of test material. The patients had low-frequency PTAs (average of 125, 250 and 500Hz) varying over a large range (<30dB HL to >70dB HL) in the ear contralateral to the implant. The patients were tested with (i) CNC words presented in quiet (. n=105) (ii) AzBio sentences presented in quiet (. n=102), (iii) AzBio sentences in noise at+10dB signal-to-noise ratio (SNR) (. n=69), and (iv) AzBio sentences at+5dB SNR (. n=64). We find maximum bimodal benefit when (i) CI scores are less than 60 percent correct, (ii) hearing loss is less than 60dB HL in low-frequencies and (iii) the test material is sentences presented against a noise background. When these criteria are met, some bimodal patients can gain 40-60 percentage points in performance relative to performance with a CI.This article is part of a Special Issue entitled <Lasker Award>.
AB - Many studies have documented the benefits to speech understanding when cochlear implant (CI) patients can access low-frequency acoustic information from the ear opposite the implant. In this study we assessed the role of three factors in determining the magnitude of bimodal benefit - (i) the level of CI-only performance, (ii) the magnitude of the hearing loss in the ear with low-frequency acoustic hearing and (iii) the type of test material. The patients had low-frequency PTAs (average of 125, 250 and 500Hz) varying over a large range (<30dB HL to >70dB HL) in the ear contralateral to the implant. The patients were tested with (i) CNC words presented in quiet (. n=105) (ii) AzBio sentences presented in quiet (. n=102), (iii) AzBio sentences in noise at+10dB signal-to-noise ratio (SNR) (. n=69), and (iv) AzBio sentences at+5dB SNR (. n=64). We find maximum bimodal benefit when (i) CI scores are less than 60 percent correct, (ii) hearing loss is less than 60dB HL in low-frequencies and (iii) the test material is sentences presented against a noise background. When these criteria are met, some bimodal patients can gain 40-60 percentage points in performance relative to performance with a CI.This article is part of a Special Issue entitled <Lasker Award>.
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U2 - 10.1016/j.heares.2014.09.010
DO - 10.1016/j.heares.2014.09.010
M3 - Article
C2 - 25285624
AN - SCOPUS:84925399455
VL - 322
SP - 107
EP - 111
JO - Hearing Research
JF - Hearing Research
SN - 0378-5955
ER -