title: Evoked acoustic emissions from the human ear. I. Equipment and response parameters.
abstract: Using signal averaging technique, stimulated acoustic emissions can be recorded from the human ear with a probe in the external ear canal. An acoustic click stimulus was used, produced by half a sinusoid of 2 kHz with the polarity corresponding to the rarefaction mode. A number of different techniques were developed in order to evaluate the latency and configuration of the emissions objectively. Recordings from a normal-hearing subject served as an example and a clear response could be traced down and below the psychoacoustic threshold. The threshold was elevated and the response pattern altered when a sensorineural hearing loss was induced by ingestion of acetylsalicylate. No response could be recorded from a deaf ear with an intact eardrum and a mobile ossicular chain.
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001241:Aspirin / Q000494:pharmacology; D001309:Auditory Threshold; D003051:Cochlea / Q000502:physiology; D003638:Deafness / Q000503:physiopathology; D004423:Ear / Q000502:physiology* / Q000503:physiopathology; D004424:Ear Canal; D005072:Evoked Potentials, Auditory / Q000187:drug effects; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D011571:Psychoacoustics; D011930:Reaction Time
chemical_list: D001241:Aspirin