Tinnitus Has Variable Effect on Otoacoustic Emissions A study designed to measure the effect of tinnitus on distortion product otoacoustic emissions, while accounting for the effects of hearing loss and aging, found that DPOAE levels were diminished in adults with hearing loss and tinnitus. The study, published in the June 2013 issue of the American Journal of ... Research in Brief
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Research in Brief  |   December 01, 2013
Tinnitus Has Variable Effect on Otoacoustic Emissions
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Hearing Disorders / Research in Brief
Research in Brief   |   December 01, 2013
Tinnitus Has Variable Effect on Otoacoustic Emissions
The ASHA Leader, December 2013, Vol. 18, 36-38. doi:10.1044/leader.RIB3.18122013.36
The ASHA Leader, December 2013, Vol. 18, 36-38. doi:10.1044/leader.RIB3.18122013.36
A study designed to measure the effect of tinnitus on distortion product otoacoustic emissions, while accounting for the effects of hearing loss and aging, found that DPOAE levels were diminished in adults with hearing loss and tinnitus. The study, published in the June 2013 issue of the American Journal of Audiology, also found that DPOAE levels in participants with normal hearing and tinnitus were enhanced, relative to DPOAE levels in the controls.
DPOAEs are used to index outer hair cell function, which has a complex association with tinnitus. This association implies DPOAEs might be used as a tool to test for tinnitus and to create a model of the neural mechanisms underlying tinnitus.
Fatima T. Husain of the University of Illinois at Urbana–Champaign measured DPOAEs twice in both ears in five participant groups: 11 young adults (ages 20–26) with normal hearing, 20 middle-age adults (ages 36–63) with normal hearing, 23 adults (ages 37–71) with high-frequency sensorineural hearing loss, 23 age-matched adults (ages 42–69) with similar hearing loss and tinnitus, and nine adults (ages 33–50) with normal hearing and chronic tinnitus.
A multivariate analysis revealed a main effect of hearing loss and age—but no effect of tinnitus—across all five groups. Separate tests revealed significant effects of age and tinnitus in the normal-hearing groups, and hearing loss in adults with or without tinnitus, but no effect of tinnitus in those with hearing loss.
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December 2013
Volume 18, Issue 12