A new approach for recording distortion product oto-acoustic emissions.
A system for recording of distortion product oto-acoustic emissions (DPOEs) utilizing a linear time-averaging technique is described. The main advantage of the system is the ability to obtain a high signal-to-noise ratio of the recordings. DPOEs have proven to yield important frequency-specific information on the behaviour of the outer hair cells in the human inner ear. DPOEs at nine audiometric frequencies, elicited at a stimulus intensity of 75 dB SPL were recorded from a group of 14 normal-hearing subjects in an attempt to establish normative data. An example of the relationship between the configuration of the conventional audiogram and DPOEs for a patient with a noise-induced hearing loss is presented to demonstrate the diagnostic value of the method.
Rasmussen
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AN
Department of Otolaryngology, Head and Neck Surgery, University Hospital, Rigshospitalet, Copenhagen, Denmark.
Osterhammel
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PA
D000161:Acoustic Stimulation; D000328:Adult; D000669:Amplifiers, Electronic; D001299:Audiometry; D007758:Ear, Inner / Q000503:physiopathology; D005260:Female; D006198:Hair Cells, Auditory; D006309:Hearing / Q000502:physiology*; D006317:Hearing Loss, Noise-Induced / Q000150:complications / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008297:Male; D009622:Noise / Q000009:adverse effects; D017084:Otoacoustic Emissions, Spontaneous