Efferent Suppression of Speech-Evoked OAEs: Implications in Aural Rehab

Principal Investigator

Peter Jacobs

Study Purpose

The purpose of this study is to help us understand how people process sounds with their ears and their brains.

Medical Condition(s)

If you participate in this study, we will measure sounds produced by your ear called otoacoustic emissions (OAEs) and sounds produced by your brain called electroencephylograms (EEG). If you agree to participate, you will sit in a sound-proof booth for two 2-hour sessions during which we will measure your OAEs and EEGs while you listen to sounds presented to your ear. An OAE is a sound that is created by your ear in response to sound. It is measured by placing a tiny microphone and speaker into your ear, presenting a sound to the ear canal such as a tone, click, or other sound, and measuring the pressure level in the ear at the time that the sound is presented. EEG is a method for measuring brain activity by placing small metal wires called electrodes on your scalp. An auditory evoked potential is a response to the electrode following the presentation of a sound. In this study, you will wear an EEG cap that has 16 EEG electrodes positioned on it so that we can measure your EEG signals. During the first visit, we will take some initial measurements to ensure that you meet the criteria of the study, which includes normal hearing. During the second visit, we will record both OAE and EEG measurements while you listen to sounds.

Eligibility Criteria

Volunteers should be age 18-30 and over and should have normal hearing.

Age Range

18 - 30

Healthy Volunteers Needed


Duration of Participation

Each subject will come for two 2-hour sessions to have their OAEs and EEGs recorded.

Minors Included



Peter G. Jacobs, 503-494-3870,


The Murdoch Foundation

Recruitment End


Compensation Provided



Subjects will be compensated $20 for each visit. If subjects attend both visits, they will have received $40 total for participating in the study.

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