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Electroacoustic hearing: Using residual acoustic hearing to address the shortcomings of

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Electroacoustic hearing: Using residual acoustic hearing to address the shortcomings of traditional cochlear implants
Ian Power & Heather Power
LING 2P91- Brock University
April 2014

Introduction On March 20, 2014, the US Food and Drug Administration (FDA) approved the first hybrid device to combine a cochlear implant (CI) with traditional amplification (USFDA, 2014). In theory, electroacoustic stimulation (EAS) allows users to take advantage of the strengths of both hearing aids (HAs) and CIs. The EAS-qualifying population currently includes individuals age 18 and older who have bilateral mild-moderate hearing loss (HL) in frequencies below 1000Hz, and bilateral, steeply sloping severe-profound HL in frequencies above 1000Hz …show more content…

Furthermore, low-frequency hearing alone is not sufficient to achieve open set speech recognition, since discrimination of most consonants and vowels requires access to higher frequencies (Hornesby & Ricketts, 2006). Even when functional levels of speech perception are achieved, however, devices are often rejected by users because of excessive feedback resulting from high levels of gain, and the requirement of uncomfortable occluding earmolds (Turner, 2006). Furthermore, discrete models of hearing aids such as the open-ear style are not powerful enough to aid severe-profound HL (Johnson, 2012). Studies examining the benefits of bimodal hearing, in which patients with a unilateral CI use a hearing aid in the contralateral ear, have noted improved ability to discriminate differences in pitch (Kang, Nimmons, Drennan, Longnion & Ruffi, 2009; Wright & Uchanski, 2012), perceive speech in noise (Dunn, Tyler & Witt, 2005; Gifford, Dorman, McKarns & Spahr, 2007; Dorman et al., 2008), and localize sound (Dunn Perreau, Gantz, & Tyler, 2010). Though high frequency amplification is not typically effective for people with a sloping severe-profound HL configuration, there is compelling evidence that low-frequency residual hearing should be preserved and amplified.
Limitations of cochlear implants alone

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