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Evaluation of Extended-wear Hearing Aid Technology for Operational Military Use
Technical Report,01 Jul 2016,30 Jun 2017
The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc Bethesda United States
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The primary goal of this research effort is to determine the potential viability of the Lyric device both as a deployable hearing aid for Service Members with existing hearing loss and, in the future, as a possible form factor for a transparent hearing protection device that could protect the hearing of normal-hearing listeners without degrading auditory situational awareness. To this point, significant progress has been made in this evaluation process. The devices have been electroacoustically tested for impulse noise protection, both with C4 and with a blast tube, and they have been found to provide impulse noise protection comparable to commonly-used passive protection earplug devices. Electroacoustic tests in continuous noise, as well as behavioral testing using the Real Ear Attenuation at Threshold method, suggest that continuous noise protection is also comparable to conventional earplug devices. Behavioral testing on listeners with normal hearing suggests that, in the active mode, the devices allow external sounds to pass through at frequencies up to 12 kHz, which provides excellent preservation of situational awareness and localization accuracy comparable to the open ear. An individual who has worn the devices in two combat deployments was identified, and his testimonial appears to provide support for the suitability of the devices for use in military environments. The final component of the study is a field-test for active duty hearing aid users is which is currently in progress at the Walter Reed NMMC.
APPROVED FOR PUBLIC RELEASE