Effects of contralateral acoustic stimulation on spontaneous otoacoustic emissions

Spontaneous otoacoustic emissions (SOAEs) were measured in the ear canal of adult humans prior to, during, and following presentation of tonal and broadband stimuli to the contralateral ear. Tones were presented at a fixed level at ten frequencies relative to the SOAE. Broadband noise was presented...

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Bibliographic Details
Published in:	The Journal of the Acoustical Society of America Vol. 94; no. 5; pp. 2649 - 2658
Main Authors:	HARRISON, W. A, BURNS, E. M
Format:	Journal Article
Language:	English
Published:	Woodbury, NY Acoustical Society of America 01-11-1993 American Institute of Physics
Subjects:	Acoustic Stimulation Auditory Perception Auditory Threshold Biological and medical sciences Cochlea - innervation Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation Female Functional Laterality Fundamental and applied biological sciences. Psychology Humans Male Neural Conduction Noise Otoacoustic Emissions, Spontaneous Reflex, Acoustic Vertebrates: nervous system and sense organs Human Reflex Acoustic stimulus Contralateral Otoacoustic emission Nervous control Auditory pathway Middle ear Olivocochlear bundle Auditory canal Organ of hearing
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Summary:	Spontaneous otoacoustic emissions (SOAEs) were measured in the ear canal of adult humans prior to, during, and following presentation of tonal and broadband stimuli to the contralateral ear. Tones were presented at a fixed level at ten frequencies relative to the SOAE. Broadband noise was presented at eight levels, from 6 to 76 dB SPL. Shifts in SOAE frequency and amplitude were observed for some subjects, for some tone conditions. Frequency shifts were always positive, whereas amplitude shifts were variable. No apparent pattern of tuning was seen, such that tones with a particular frequency relationship to the SOAEs induced greater changes in the SOAEs. Systematic changes in frequency and amplitude of SOAEs were observed for increasing level of broadband noise for all subjects. Results are discussed with respect to possible mechanism(s) responsible for the alterations in SOAEs: Transcranial conduction; the olivocochlear system; and/or the middle-ear reflex arc.
ISSN:	0001-4966 1520-8524
DOI:	10.1121/1.407349