Harrison W A, Burns E M
Department of Speech and Hearing Sciences, University of Washington, Seattle 98195.
J Acoust Soc Am. 1993 Nov;94(5):2649-58. doi: 10.1121/1.407349.
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.
在向成年受试者对侧耳呈现音调刺激和宽带刺激之前、期间及之后，测量其耳道内的自发性耳声发射（SOAE）。相对于SOAE，在十个频率处以固定水平呈现音调。以6至76 dB SPL的八个水平呈现宽带噪声。在某些受试者中，在某些音调条件下观察到SOAE频率和幅度的变化。频率变化始终为正，而幅度变化则各不相同。未观察到明显的调谐模式，即与SOAE具有特定频率关系的音调在SOAE中引起更大的变化。对于所有受试者，随着宽带噪声水平的增加，观察到SOAE频率和幅度的系统性变化。针对可能导致SOAE改变的机制（经颅传导、橄榄耳蜗系统和/或中耳反射弧）对结果进行了讨论。
